Published 2026-09-24
Keywords
- Cap carbonate,
- Eureka moment,
- Sea-ice albedo bifurcation,
- Seawater Sr isotopes,
- Snowball Earth
- Strangelove ocean ...More
How to Cite
Hoffman, P. F. (2026). The Tooth of Time: Eureka and Other Moments Toward Snowball Earth. Geoscience Canada, 53(3), 213–240. https://doi.org/10.12789/geocanj.2026.53.234
References
- Abbot, D.S., 2014, Resolved Snowball Earth clouds: Journal of Climate, v. 27, p. 4391−4402, https://doi.org/10.1175/JCLI-D-13-00738.1.
- Abbot, D.S., Voigt, A., Li, D.W., Le Hir, G., Pierrehumbert, R.T., Branson, M., Pollard, D., and Koll, D.D.B., 2013, Robust elements of Snowball Earth atmospheric circulation and oases for life: Journal of Geophysical Research: Atmospheres, v. 118, p. 6017−6027, https://doi.org/10.1002/jgrd.50540.
- Ahm, A.-S.C., Bjerrum, C.J., Hoffman, P.F., Macdonald, F.A., Maloof, A.C., Rose, C.V., Strauss, J.V., and Higgins, J.A., 2021, The Ca and Mg isotope record of the Cryogenian Trezona carbon isotope excursion: Earth and Planetary Science Letters, v. 568, no. 117002, https://doi.org.10.1016/j.epsl.2021.117002.
- Allen, P.A., and Hoffman, P.F., 2005, Extreme winds and waves in the aftermath of a Neoproterozoic glaciation: Nature, v. 433, p. 123−127, https://doi.org/10.1038/nature03176.
- Archer, D., and Pierrehumbert, R., 2011, The Warming Papers: The Scientific Foundation for the Climate Change Forecast: Wiley-Blackwell, Oxford, 419 p.
- Ashkenazy, Y., Gildor, H., Losch, M., Macdonald, F.A., Schrag, D.P., and Tziperman, E., 2013, Dynamics of a Snowball Earth ocean: Nature, v. 495, p. 90−93, https://doi.org/10.1038/nature11894.
- Bahcall, J.N., Pinsonneault, M.H., and Basu, S., 2001, Solar models: current epoch and time dependences, neutrinos, and helioseismological properties: Astrophysical Journal, v. 555, p. 990−1012, https://doi.org/10.1086/321493.
- Bao, H.M., 2015, Sulfate: A time capsule for Earth’s O2, O3, and H2O: Chemical Geology, v. 395, p. 108−118, https://doi.org/10.1016/j.chemgeo.2014.11.025.
- Bao, H.M., Lyons, J.R., and Zhou, C.M., 2008, Triple oxygen isotope evidence for elevated CO2 levels after a Neoproterozoic glaciation: Nature, v. 453, p. 504−506, https://doi.org/10.1038/nature06959.
- Bao, H.M., Fairchild, I.J., Wynn, P.M., and Spötl, C., 2009, Stretching the envelope of past surface environments: Neoproterozoic glacial lakes from Svalbard: Science, v. 323, p. 119−122, https://doi.org/10.1126/science.1165373.
- Bao, H.M., Cao, X.B., and Hayles, J.A., 2016, Triple oxygen isotopes: fundamental relationships and applications: Annual Review of Earth and Planetary Sciences, v. 44, p. 463–492, https://doi.org/10.1146/annurev-earth-060115-012340.
- Bednarick, A.L., Bucholz, C.E., DePaolo, D.J., and Stolper, D.A., 2024, Temporal covariation of island arc Sr isotopes and seawater chemistry over the past 2 billion years: Proceedings of the National Academy of Sciences USA, v. 121, no. e2401832121, https://doi.org/10.1073/pnas.2401832121.
- Benn, D.I., Le Hir, G., Bao, H.M., Donnadieu, Y., Dumas, C., Fleming, E.J., Hambrey, M.J., McMillan, E.A., Petronis, M.S., Ramstein, G., Stevenson, C.T.E., Wynn, P.M., and Fairchild, I.J., 2015, Orbitally forced ice sheet fluctuations during the Marinoan Snowball Earth glaciation: Nature Geoscience, v. 8, p. 704−708, https://doi.org/10.1038/NGEO2502.
- Bold, U., Smith, E.F., Rooney, A.D., Bowring, S.A., Buchwaldt, R., Dudás, F.Ö., Ramezani, J., Crowley, J.L., Schrag, D.P., and Macdonald, F.A., 2016, Neoproterozoic stratigraphy of the Zavkhan terrane of Mongolia: the backbone for Cryogenian and early Ediacaran chemostratigraphic records: American Journal of Science, v. 316, p. 1−63, https://doi.org/10.2475/01.2016.01.
- Bowring, S.A., Williams, I.S., and Compston, W., 1989, 3.96 Ga gneisses from the Slave Province, Northwest Territories, Canada: Geology, v. 17, p. 971−975, https://doi.org/10.1130/0091-7613(1989)0173C0971:GGFTSP3E2.3.CO;2.
- Bowring, S.A., Housh, T.B., and Isachsen, C.E., 1990, The Acasta gneisses: remnant of Earth’s early crust, in Newsom, H.E., and Jones, J.H., eds., Origin of the Earth: Oxford University Press, Oxford, UK, p. 319−343, https://doi.org/10.1093/oso/9780195066197.003.0018.
- Broecker, W.S., and Peng, T.H., 1982, Tracers in the Sea: Eldigio Press, Palisades, NY, 690 p.
- Budyko, M.I., 1968a, On the origin of glacial epochs [English translation]: Meteorology and Hydrology, v. 2, p. 3−8.
- Budyko, M.I., 1968b, Polar ice and climate, in Fletcher, J.O., ed., Proceedings of the Symposium on the Arctic Heat Budget and Atmospheric Circulation, January 31 through February 4, 1966, Lake Arrowhead, California (p. 3−21): The Rand Corporation, Santa Monica, CA.
- Budyko, M.I., 1969, The effect of solar radiation variations on the climate of the Earth: Tellus, v. 21, p. 611−619, https://doi.org/10.1111/j.2153-3490.1969.tb00466.x.
- Budyko, M.I., 1974, Climate and Life [English translation]: Academic Press, Oxford, 508 p.
- Budyko, M.I., 1977, Climatic Changes [English translation]: American Geophysical Union, Washington, DC, 261 p., https://doi.org/10.1029/SP010.
- Budyko, M.I., 1982, The Earth’s Climate: Past and Future [English translation]: Academic Press, Oxford, 307 p.
- Caldeira, K., and Kasting, J.F., 1992, Susceptibility of the early Earth to irreversible glaciation caused by carbon dioxide clouds: Nature, v. 359, p. 226−228, https://doi.org/10.1038/359226a0.
- Canfield, D.E., and Raiswell, R., 1999, The evolution of the sulfur cycle: American Journal of Science, v. 299, p. 697−723, https://doi.org/10.2475/ajs.299.7-9.697.
- Cao, X.B., and Bao, H.M., 2013, Dynamic model constraints on oxygen−17 depletion in atmospheric O2 after a snowball Earth: Proceedings of the National Academy of Sciences USA, v. 110, p. 14546−14550, https://doi.org/10.1073/pnas.1302972110.
- Cloud, P., Wright, L.A., Williams, E.G., Diehl, P., and Walter, M.R., 1974, Giant stromatolites and associated vertical tubes from the upper Proterozoic Noonday Dolomite, Death Valley region, eastern California: Geological Society of America Bulletin, v. 85, p. 1869−1882, https://doi.org/10.1130/0016-7606(1974)853C1869:GSAAVT3E2.0.CO;2.
- Collins, A.S., Blades, M.L., Merdith, A.S., and Foden, J.D., 2021, Closure of the Proterozoic Mozambique Ocean was instigated by a late Tonian plate reorganization: Nature, Communications Earth and Environment, v. 2, no. 75, https://doi.org/10.1038/s43247-021-00149-z.
- Corsetti, F.A., and Grotzinger, J.P., 2005, Origin and significance of tube structures in Neoproterozoic post-glacial cap carbonates: Example from Noonday Dolomite, Death Valley, United States: Palaios, v. 20, p. 348−362, https://doi.org/10.2110/palo.2003.p03-96.
- Crockford, P.W., Cowie, B.R., Johnston, D.T., Hoffman, P.F., Sugiyama, I., Pellerin, A., Bui, T.H., Hayles, J., Halverson, G.P., Macdonald, F.A., and Wing, B.A., 2016, Triple oxygen and multiple sulfur isotope constraints on the evolution of the post-Marinoan sulfur cycle: Earth and Planetary Science Letters, v. 435, p. 74−83, https://doi.org/10.1016/j.epsl.2015.12.017.
- Crockford, P.W., Hodgskiss, M.S.W., Uhlein, G.J., Caxito, F., Hayles, J.A., and Halverson, G.P., 2018, Linking paleocontinents through triple oxygen isotope anomalies: Geology, v. 46, p. 179−182, https://doi.org/10.1130/G39470.1.
- Crockford, P.W., Wing, B.A., Paytan, A., Hodgskiss, M.S.W., Mayfield, K.K., Hayles, J.A., Middleton, J.E., Ahm, A.-S.C., Johnston, D.T., Caxito, F., Uhlein, G., Halverson, G.P., Eickmann, B., Torres, M., and Horner, T.J., 2019, Barium-isotopic constraints on the origin of post-Marinoan barites: Earth and Planetary Science Letters, v. 519, p. 234−244, https://doi.org/10.1016/j.epsl.2019.05.018.
- Crockford, P.W., Mehra, A., Domack, E., and Hoffman, P.F., 2021, An occurrence of radially symmetric sedimentary structures in the basal Ediacaran cap dolostone (Keilberg Member) of the Otavi Group: Communications of the Geological Survey of Namibia, v. 23, p. 26−38, https://the-eis.com/elibrary/taxonomy/term/103650?page=10.
- Crowell, J.S., 1957, Origin of pebbly mudstones: Geological Society of America Bulletin, v. 68, p. 993−1010, https://doi.org/10.1130/0016-7606(1957)685B993:OOPM5D2.0.CO;2.
- Cuffey, K.M., and Patterson, W.S.B., 2010, The Physics of Glaciers, 4th Edition: Butterworth−Heinemann, Oxford, UK, 701 p.
- Dalton, L.A., Bosak, T., Macdonald, F.A., Lahr, D.J.G., and Pruss, S.B., 2013, Preservational and morphological variability of assemblages of agglutinated eukaryotes in Cryogenian cap carbonates of northern Namibia: Palaios, v. 28, p. 67−79, https://doi.org/10.2110/palo.2012.p12-084r.
- Dalziel, I.W.D., 1991, Pacific margins of Laurentia and Antarctica−Australia as a conjugate rift pair: Evidence and implications for an Eocambrian supercontinent: Geology, v. 19, p. 598−601, https://doi.org/10.1130/0091-7613(1991)0193C0598:PMOLAE3E2.3.CO;2.
- Davis, D.W., 2008, Sub-million-year age resolution of Precambrian igneous events by thermal extraction-thermal-ionization mass spectrometer Pb dating of zircon: Application to crystallization of the Sudbury impact melt sheet: Geology, v. 36, p. 383−386, https://doi.org/10.1130/G24502A.1.
- Debenham, F., 1920, A new mode of transportation by ice: the raised marine muds of South Victoria Land (Antarctica): Quarterly Journal of the Geological Society, v. 75, p. 51−76, https://doi.org/10.1144/GSL.JGS.1919.075.01-04.08.
- Delaney, M.L., 1998, Phosphorus accumulation in marine sediments and the oceanic phosphorus cycle: Global Biogeochemical Cycles, v. 12, p. 563−572, https://doi.org/10.1029/98GB02263.
- Delaney, M.L., and Anderson L.D., 1997, Phosphorus geochemistry in Ceara Rise sediments, in Shackleton, N.J., Curry, W.B., Richter, C., and Bralower, T.J., eds., Proceedings of the Ocean Drilling Program Scientific Results: Ocean Drilling Program, College Station, TX, v. 154, p. 475−482, https://doi.org/10.2973/odp.proc.sr.154.124.1997.
- Domack, E.W., and Hoffman, P.F., 2011, An ice grounding-line wedge from the Ghaub glaciation (635 Ma) on the distal foreslope of the Otavi carbonate platform, Namibia, and its bearing on the snowball Earth hypothesis: Geological Society of America Bulletin, v. 123, p. 1448−1477, https://doi.org/10.1130/B30217.1.
- Donnadieu, Y., Fluteau, F., Ramstein, G., Ritz, C., and Besse, J., 2003, Is there a conflict between the Neoproterozoic glacial deposits and the snowball Earth interpretation: an improved understanding with numerical modeling: Earth and Planetary Science Letters, v. 208, p. 101−112, https://doi.org/10.1016/S0012-821X(02)01152-4.
- Embleton, B.J.J., and Williams, G.E., 1986, Low palaeolatitude of deposition for late Precambrian periglacial varvites in South Australia: implications for palaeoclimatology: Earth and Planetary Science Letters, v. 79, p. 419−430, https://doi.org/10.1016/0012-821X(86)90197-4.
- Eskola, P., 1920, The mineral facies of rocks: Norsk Geologisk Tidsskrift, v. 6, p. 145−194.
- Eyles, N., and Young, G.M., 1994, Geodynamic controls on glaciation in Earth history, in Deynoux, M., Miller, J.M.G., Domack, E.W., Eyles, N., Fairchild, I., and Young, G.M., eds., Earth’s Glacial Record: Cambridge University Press, Cambridge, UK, p. 1−28, https://doi.org/10.1017/CBO9780511628900.002.
- Fabre, S., and Berger, G., 2012, How tillite weathering during the snowball Earth aftermath induced cap carbonate deposition: Geology, v. 40, p. 1027−1030, https://doi.org/10.1130/G33340.1.
- Fairchild, I.J., Spencer, A.M., Ali, D.O., Anderson, R.P., Anderton, R., Boomer, I., Dove, D., Evans, J.D., Hambrey, M.J., Howe, J., Sawaki, Y., Shields, G.A., Skelton, A., Tucker, M.E., Wang, Z.R., and Zhou, Y., 2018, Tonian−Cryogenian boundary sections of Argyll, Scotland: Precambrian Research, v. 319, p. 37−64, https://doi.org/10.1016/j.precamres.2017.09.020.
- Farquhar, J., Bao, H.M., and Thiemens, M., 2000, Atmospheric influence of Earth’s earliest sulfur cycle: Science, v. 289, p. 756−758, https://doi.org/10.1126/science.289.5480.756.
- Gevers, T.W., 1931, An ancient tillite in South-West Africa: Transactions of the Geological Society of South Africa, v. 34, p. 1−17.
- Goddéris, Y., Le Hir, G., Macouin, M., Donnadieu, Y., Hubert-Théou, L., Dera, G., Aretz, M., Fluteau, F., Li, Z.X., and Halverson, G.P., 2017, Paleogeographic forcing of the strontium isotopic cycle in the Neoproterozoic: Gondwana Research, v. 42, p. 151–162, https://doi.org/10.1016/j.gr.2016.09.013.
- Goodman, J.C., and Pierrehumbert, R.T., 2003, Glacial flow of floating marine ice in “Snowball Earth”: Journal of Geophysical Research, v. 108, no. 3308, https://doi.org/10.1029/2002JC001471.
- Goodman, J.C., and Strom, D.C., 2013, Feedbacks in a coupled ice-atmosphere-dust model of the glacial Neoproterozoic “Mudball Earth”: Journal of Geophysical Research, v. 118, p. 11546–11557, https://doi.org/10.1002/jgrd.50849.
- Gough, D.O., 1981, Solar interior structure and luminosity variations: Solar Physics, v. 74, p. 21−34, https://doi.org/10.1007/BF00151270.
- Grotzinger, J.P., and Knoll, A.H., 1995, Anomalous carbonate precipitates: is the Precambrian the key to the Permian?: Palaios, v. 10, p. 578−596, https://doi.org/10.2307/3515096.
- Halverson, G.P., Hoffman, P.F., Schrag, D.P., and Kaufman, A.J., 2002, A major perturbation of the carbon cycle before the Ghaub glaciation (Neoproterozoic) in Namibia: prelude to snowball Earth?: Geochemistry, Geophysics, Geosystems, v. 3, p. 1–24, https://doi.org/10.1029/2001GC000244.
- Halverson, G.P., Dudás, F.Ö., Maloof, A.C., and Bowring, S.A., 2007, Evolution of the 87Sr/86Sr composition of Neoproterozoic seawater: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 256, p. 103−129, https://doi.org/10.1016/j.palaeo.2007.02.028.
- Halverson, G.P., Poitrasson, F., Hoffman, P.F., Nédélec, A., Montel, J.-M., and Kirby, J., 2011, Fe isotope and trace element geochemistry of the Neoproterozoic syn-glacial Rapitan iron formation: Earth and Planetary Science Letters, v. 309, p. 100−112, https://doi.org/10.1016/j.epsl.2011.06.021.
- Halverson, G.P., Porter, S., and Shields, G., 2020, The Tonian and Cryogenian Periods, in Gradstein, F.M., Ogg, J.G., Schmitz, M.D., and Ogg, G.M., eds., Geologic Time Scale 2020: Elsevier, Amsterdam, p. 495−519, https://doi.org/10.1016/B978-0-12-824360-2.00017-6.
- Hambrey, M.J., and Harland, W.B., 1981, Earth’s pre-Pleistocene Glacial Record: Cambridge University Press, Cambridge, UK, 1004 p.
- Harland, W.B., 1964, Evidence of late Precambrian glaciation and its significance, in Nairn, A.E.M., ed., Problems in Palaeoclimatology: John Wiley Interscience, London, UK, p. 119−149.
- Harland, W.B., and Rudwick, M.J.S., 1964, The great infra-Cambrian ice age: Scientific American, August 1964, p. 42–49.
- Hartmann, D.L., 2016, Global Physical Climatology, 2nd Edition: Elsevier, Amsterdam, 485 p.
- Hartnady, C.J.H., 1991a, About turn for supercontinents: Nature, News and Views, v. 352, p. 476−478, https://doi.org/10.1038/352476d0.
- Hartnady, C.J.H., 1991b, Supercontinents and geotectonic megacycles: Precambrian Research Unit, University of Cape Town, Information Circular No. 1, Pt. 2, p. 6−16.
- Hawes, I., Jungblut, A.D., Matys, E.D., and Summons, R.E., 2018, The “dirty ice” of the McMurdo Ice Shelf: analogues for biological oases during the Cryogenian: Geobiology, v. 16, p. 369−377, https://doi.org/10.1111/gbi.12280.
- Hedberg, R.M., 1979, Stratigraphy of the Ovamboland Basin, South-West Africa: Bulletin 24, Precambrian Research Unit, University of Cape Town, South Africa, 365 p. and 6 map sheets (scale 1:250 000).
- Higgins, J.A., and Schrag, D.P., 2003, Aftermath of a snowball Earth: Geochemistry, Geophysics, Geosystems, v. 4, no. 1028, https://doi.org/10.1029/2002GC000403.
- Hoffman, P.F., 1967, Algal stromatolites: use in stratigraphic correlation and paleocurrent determination: Science, v. 157, p. 1043−1045, https://doi.org/10.1126/science.157.3792.1043.
- Hoffman, P.F., 1984, Geology, northern Internides of Wopmay Orogen, District of Mackenzie, Northwest Territories: Geological Survey of Canada, “A” Series Map, 1576A, scale 1:250K, https://doi.org/10.4095/120011 (free download).
- Hoffman, P.F., 1991, Did the breakout of Laurentia turn Gondwanaland inside-out?: Science, v. 252, p. 1409−1412, https://doi.org/10.1126/science.252.5011.1409.
- Hoffman, P.F., 1996, Geology, northern externides of Wopmay Orogen, District of Mackenzie, Northwest Territories: Geological Survey of Canada, Open File 3251, scale 1:250K, https://doi.org/10.4095/207791 (free download).
- Hoffman, P.F., 1999, The break-up of Rodinia, birth of Gondwana, true polar wander and the snowball Earth: Journal of African Earth Sciences, v. 28, p. 17−33, https://doi.org/10.1016/S0899-5362(99)00018-4.
- Hoffman, P.F., 2011, Strange bedfellows: glacial diamictite and cap carbonate from the Marinoan (635 Ma) glaciation in Namibia: Sedimentology, v. 58, p. 57−119, https://doi.org/10.1111/j.1365-3091.2010.01206.x.
- Hoffman, P.F., 2012, The Tooth of Time: Cesare Emiliani: Geoscience Canada, v. 39, p. 13−16, https://journals.lib.unb.ca/index.php/GC/article/view/19452.
- Hoffman, P.F., 2016, Cryoconite pans on Snowball Earth: supraglacial oases for Cryogenian eukaryotes?: Geobiology, v. 14, p. 531−542, https://doi.org/10.1111/gbi.12191.
- Hoffman, P.F., 2020, Cusp tectonics: an Ediacaran megakarst landscape and bidirectional mass slides in a Pan-African syntaxis (NW Namibia), in Murphy, J.B., Strachan, R.A., and Quesada, C., eds., Pannotia to Pangea: Neoproterozoic and Paleozoic Orogenic Cycles in the Circum-Atlantic Region: Geological Society, London, Special Publications, v. 503, p. 105−142, https://doi.org/10.1144/SP503-2019-253.
- Hoffman, P.F., 2023, Glacial erosion on a snowball Earth: testing for bias in flux balance, geographic setting, and tectonic regime: Canadian Journal of Earth Sciences, v. 60, p. 765−777, https://doi.org/10.1139/cjes-2022-0004.
- Hoffman, P.F., 2025, Ecosystem relocation on Snowball Earth: polar−alpine ancestry of the extant surface biosphere?: Proceedings of the National Academy of Sciences USA, v. 122, no. e2414059122, https://doi.org/10.1073/pnas.2414059122.
- Hoffman, P.F., 2026, Two asynchronous Ediacaran paleoceans in the Damara orogen of Namibia?: Earth-Science Reviews, v. 279, no. 105537, https://doi.org/10.1016/j.earscirev.2026.105537.
- Hoffman, P.F., in press, Snowball Earth in 4-G: Geology, Geophysics, Geochemistry, Geobiology: Phoenix Science Press, Nanjing, China.
- Hoffman, P.F., and Hall, L., 1993, Geology, Slave Craton and Environs, District of Mackenzie and Northwest Territories: Geological Survey of Canada, Open File 2559, scale, 1:1M, https://doi.org.10.4095/183951 (free download).
- Hoffman, P.F., and Halverson, G.P., 2011, Neoproterozoic glacial record in the Mackenzie Mountains, northern Canadian Cordillera, in Arnaud, E., Halverson, G.P., and Shields-Zhou, G., eds., The Geologic Record of Neoproterozoic Glaciations: Geological Society, London, Memoir 36, p. 397−411, https://doi.org/10.1144/M36.36.
- Hoffman, P.F., and Li, Z.X., 2009, A palaeogeographic context for Neoproterozoic glaciation: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 277, p. 158−172, https://doi.org/10.1016/j.palaeo.2009.03.013.
- Hoffman, P.F., and Macdonald, F.A., 2010, Sheet-crack cements and early regression in Marinoan (635 Ma) cap dolostones: regional benchmarks of vanishing ice-sheets?: Earth and Planetary Science Letters, v. 300, p. 374−384, https://doi.org/10.1016/j.epsl.2010.10.027.
- Hoffman, P.F., and Schrag, D.P., 2002, The snowball Earth hypothesis: testing the limits of global change: Terra Nova, v. 14, p. 129−155, https://doi.org/10.1046/j.1365-3121.2002.00408.x.
- Hoffman, P.F., Hawkins, D.P., Isachsen, C.E., and Bowring, S.A., 1996, Precise U−Pb zircon ages for early Damaran magmatism in the Summas Mountains and Welwitschia Inlier, northern Damara Belt, Namibia: Communications of the Geological Survey of Namibia, v. 11, p. 47−52.
- Hoffman, P.F., Kaufman, A.J., and Halverson, G.P., 1998a, Comings and goings of global glaciations on a Neoproterozoic tropical platform in Namibia: GSA Today, v. 8, no. 5, p. 1−9.
- Hoffman, P.F., Kaufman, A.J., Halverson, G.P., and Schrag, D.P., 1998b, A Neoproterozoic Snowball Earth: Science, v. 281, p. 1342−1346, https://doi.org/10.1126/science.281.5381.1342.
- Hoffman, P.F., Abbot, D.S., Ashkenazy, Y., Benn, D.I., Brocks, J.J., Cohen, P.A., Cox, G.M., Creveling, J.R., Donnadieu, Y., Erwin, D.H., Fairchild, I.J., Ferreira, D., Goodman, J.C., Halverson, G.P., Jansen, M.F., Le Hir, G., Love, G.D., Macdonald, F.A., Maloof, A.C., Partin, C.A., Ramstein, G., Rose, B.E.J., Rose, C.V., Sadler, P.M., Tziperman, E., Voigt, A., and Warren, S.G., 2017a, Snowball Earth climate dynamics and Cryogenian geology–geobiology: Science Advances, v. 3, no. e1600983, https://doi.org/10.1126/sciadv.1600983.
- Hoffman, P.F., Lamothe, K.G., LoBianco, S.J.C., Hodgskiss, M.S.W., Bellefroid, E.J., Johnson, B.W., Hodgin, E.B., and Halverson, G.P., 2017b, Sedimentary depocenters on Snowball Earth: Case studies from the Sturtian Chuos Formation in northern Namibia: Geosphere, v. 13, p. 811−837, https://doi.org/10.1130/GES01457.1.
- Hoffman, P.F., Halverson, G.P., Schrag, D.P., Higgins, J.A., Domack, E.W., Macdonald, F.A., Pruss, S.B., Blättler, C.L., Crockford, P.W., Hodgin, E.B., Bellefroid, E.J., Johnson, B.W., Hodgskiss, M.S.W., Lamothe, K.G., LoBianco, S.J.C., Busch, J.F., Howes, B.J., Greenman, J.W., and Nelson, L.L., 2021, Snowballs in Africa: sectioning a long-lived Neoproterozoic carbonate platform and its bathyal foreslope (NW Namibia): Earth-Science Reviews, v. 219, no. 103616, https://doi.org/10.1016/j.earscirev.2021.103616.
- Hoffmann, K.-H., and Prave, A.R., 1996, A preliminary note on a revised subdivision and regional correlation of the Otavi Group based on glaciogenic diamictites and associated cap dolomites: Communications of the Geological Survey of Namibia, v. 11, p. 77−82.
- Hoffmann, K.-H., Condon, D.J., Bowring, S.A., and Crowley, J.L., 2004, U−Pb zircon date from the Neoproterozoic Ghaub Formation, Namibia: constraints on Marinoan glaciation: Geology, v. 32, p. 817−820, https://doi.org/10.1130/G20519.1.
- Hsü, K.J., and McKenzie, J.A., 1985, A “Strangelove” ocean in the earliest Tertiary, in Sundquist, E.T., and Broecker, W.S., eds., The Carbon Cycle and Atmospheric CO2: Natural Variations Archean to Present: American Geophysical Union, Geophysical Monograph 32, p. 487−492.
- Jacobsen, S.B., and Kaufman, A.J., 1999, The Sr, C and O isotopic evolution of Neoproterozoic seawater: Chemical Geology, v. 161, p. 37−57, https://doi.org/10.1016/S0009-2541(99)00080-7.
- Jansen, M.F., 2016, The turbulent circulation of a Snowball Earth ocean: Journal of Physical Oceanography, v. 46, p. 1917−1933, https://doi.org/10.1175/JPO-D-15-0224.1.
- Jiang, L.-Q., Feely, R.A., Carter, B.R., Greeley, D.J., Gledhill, D.K., and Arzayus, K.M., 2015, Climatological distribution of aragonite saturation state in the global oceans: Global Biogeochemical Cycles, v. 29, p. 1656−1673, https://doi.org/10.1002/2015GB005198.
- Johnston, D.T., Macdonald, F.A., Gill, B.C., Hoffman, P.F., and Schrag, D.P., 2012, Uncovering the Neoproterozoic carbon cycle: Nature, v. 483, p. 320−323, https://doi.org/10.1038/nature10854.
- Kaufman, A.J., Hayes, J.M., Knoll, A.H., and Germs, G.J.B., 1991, Isotopic compositions of carbonates and organic carbon from upper Proterozoic successions in Namibia: stratigraphic variation and the effects of diagenesis and metamorphism: Precambrian Research, v. 49, p. 301−327, https://doi.org/10.1016/0301-9268(91)90039-D.
- Kaufman, A.J., Knoll, A.H., and Narbonne, G.M., 1997, Isotopes, ice ages, and terminal Proterozoic Earth history: Proceedings of the National Academy of Sciences USA, v. 94, p. 6600−6605, https://doi.org/10.1073/pnas.94.13.6600.
- Kellerhals, P., and Matter, A., 2003, Facies analysis of a glaciomarine sequence, the Neoproterozoic Mirbat Sandstone Formation, Sultanate of Oman: Eclogae Geologicae Helvetiae, v. 96, p. 49−70, https://doi.org/10.5169/seals-169006.
- Kennedy, M.J., Christie-Blick, N., and Prave, A.R., 2001, Carbon isotopic composition of Neoproterozoic glacial carbonates as a test of paleoceanographic models for snowball Earth phenomena: Geology, v. 29, p. 1135−1138, https://doi.org/10.1130/0091-7613(2001)0293C1135:CICONG3E2.0.CO;2.
- Kerr, R.A., 1998, Did an ancient deep freeze nearly doom life?: Science, v. 281, p. 1259−1261, https://doi.org/10.1126/science.281.5381.1259.
- Kerr, R.A., 2000, An appealing Snowball Earth that’s still hard to swallow: Science, v. 287, p. 1734−1736, https://doi.org/10.1126/science.287.5459.1734.
- Ketchum, K.Y., Heaman, L.M., Bennett, G., and Hughes, D.J., 2013, Age, petrogenesis and tectonic setting of the Thessalon volcanic rocks, Huronian Supergroup, Canada: Precambrian Research, v. 233, p. 144−172, https://doi.org/10.1016/j.precamres.2013.04.009.
- Kirschvink, J.L., 1992, Late Proterozoic low-latitude glaciation: the snowball Earth, in Schopf, J.W., and Klein, C., eds., The Proterozoic Biosphere: Cambridge University Press, Cambridge, U.K., p. 51−52.
- Kirschvink, J.L., Ripperdan, R.L., and Evans, D.A.D., 1997, Evidence for a large-scale reorganization of Early Cambrian continental masses by inertial interchange true polar wander: Science, v. 277, p. 541−545, https://doi.org/10.1126/science.277.5325.541.
- Klein, C., and Beukes, N.J., 1993, Sedimentology and geochemistry of the glaciogenic late Proterozoic Rapitan Iron-Formation in Canada: Economic Geology, v. 88, p. 542−565, https://doi.org/10.2113/gsecongeo.88.3.542.
- Knoll, A.H., 1991, End of the Proterozoic Eon: Scientific American, p. 64−73, https://doi.org/10.1038/scientificamerican1091-64.
- Knoll, A.H., and Walter, M.R., 1992, Latest Proterozoic stratigraphy and Earth history: Nature, v. 365, p. 673−678, https://doi.org/10.1038/356673a0.
- Knoll, A.H., Hayes, J.M., Kaufman, A.J., Swett, K., and Lambert, I.B., 1986, Secular variation in carbon isotope ratios from Upper Proterozoic successions of Svalbard and East Greenland: Nature, v. 321, p. 832−838, https://doi.org/10.1038/321832a0.
- Kröner, A., 1981, Late Precambrian diamictites of South Africa and Namibia, in Hambrey, M.J., and Harland, W.B., eds., Earth’s pre-Pleistocene glacial record: Cambridge University Press, Cambridge, U.K., p. 167−177.
- Kroopnick, P.M., 1985, The distribution of 13C of ΣCO2 in the world oceans: Deep Sea Research, v. 32, p. 57–84, https://doi.org/10.1016/0198-0149(85)90017-2.
- Kump, L.R., 1991, Interpreting carbon-isotope excursions: Strangelove oceans: Geology, v. 19, p. 299−302, https://doi.org/10.1130/0091-7613(1991)0193C0299:ICIESO3E2.3.CO;2.
- Kump, L.R., and Seyfried Jr, W.E., 2005, Hydrothermal Fe fluxes during the Precambrian: Effect of low oceanic sulfate concentrations and low hydrostatic pressure on the composition of black smokers: Earth and Planetary Science Letters, v. 235, p. 654−662, https://doi.org/10.1016/j.epsl.2005.04.040.
- Kump, L.R., Brantley, S.L., and Arthur, M.A., 2000, Chemical weathering, atmospheric CO2, and climate: Annual Reviews of Earth and Planetary Sciences, v. 28, p. 611−667, https://doi.org/10.1146/annurev.earth.28.1.611.
- Lechte, M.A., Wallace, M.W., and Hoffmann, K.-H., 2018, Glacio-marine iron formation deposition in a c. 700 Ma glaciated margin: insights from the Chuos Formation, Namibia, in Le Heron, D.P., Hogan, K.A., Phillips, E.R., Huuse, M., Busfield, M.E., and Graham, A.G.C., eds., Glaciated Margins: The Sedimentary and Geophysical Archive: Geological Society, London, Special Publication 475, p. 9−34, https://doi.org/10.1144/SP475.2.
- Lechte, M.A., Wallace, M.W., Hood, A. v.S., Li, W.Q., Jiang, G.Q., Halverson, G.P., Asael, D., McColl, S.L., and Planavsky, N.J., 2019, Subglacial meltwater supported aerobic marine habitats during Snowball Earth: Proceedings of the National Academy of Sciences USA, v. 116, p. 25478−25483, https://doi.org.10.1073/pnas.1909165116.
- Le Roex, H.D., 1941, A tillite in the Otavi Mountains, S.W.A.: Transactions of the Geological Society of South Africa, v. 44, p. 207−218.
- Li, D.W., and Pierrehumbert, R.T., 2011, Sea glacier flow and dust transport on Snowball Earth: Geophysical Research Letters, v. 38, no. L17501, https://doi.org/10.1029/2011GL048991.
- Lindzen, R.S., and Hou, A.V., 1988, Hadley circulations for zonally averaged heating centered off the equator: Journal of Atmospheric Sciences, v. 45, p. 2416–2427, https://doi.org/10.1175/1520-0469(1988)0453C2416:HCFZAH3E2.0.CO;2.
- Liu, C., Wang, Z.R., Raub, T.D., Macdonald, F.A., and Evans, D.A.D., 2014, Neoproterozoic cap-dolostone deposition in stratified glacial meltwater plume: Earth and Planetary Science Letters, v. 404, p. 22−32, https://doi.org/10.1016/j.epsl.2014.06.039.
- Liu, Y.G., Yang, J., Bao, H.M., Shen, B., and Hu, Y.Y., 2020, Large equatorial seasonal cycle during Marinoan snowball Earth: Science Advances, v. 6, no. eaay2471, https://doi.org/10.1126/sciadv.aay2471.
- Luz, B., and Barkan, E., 2000, Assessment of oceanic productivity with the triple-isotope composition of dissolved oxygen: Science, v. 288, p. 2028−2031, https://doi.org/10.1126/science.288.5473.2028.
- Luz, B., Barkan, E., Bender, M.L., Thiemens, M.H., and Boering, K.A., 1999, Triple-isotope composition of atmospheric oxygen as a tracer of biosphere productivity: Nature, v. 400, p. 547−550, https://doi.org/10.1038/22987.
- Macdonald, F.A., Renger, E., Tasistro-Hart, A.R., Byerly, B.L., Jackson, M.G., Bergmann, K.D., Horner, T.J., and Crockford, P.W., 2025, Mantle-like Sr isotopes in a Sturtian cap carbonate in Oman: Geology, v. 53, p. 753−756, https://doi.org/10.1130/G53385.1.
- Marshall, H.G., Walker, J.C.G., and Kuhn, W.R., 1988, Long-term climate change and the geochemical cycle of carbon: Journal of Geophysical Research, v. 93, p. 791−801, https://doi.org/10.1029/JD093iD01p00791.
- Marshall, S.J., 2012, The Cryosphere: Princeton University Press, Princeton, NJ, 287 p.
- Martin, H., 1965, The Precambrian geology of South West Africa and Namaqualand: Precambrian Research Unit, University of Cape Town, South Africa, 159 p. and map (scale 1:5M).
- Martin, H., Porada, H., and Walliser, O.H., 1985, Mixtite deposits of the Damara sequence, Namibia: problems of interpretation: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 51, p. 159−196, https://doi.org/10.1016/0031-0182(85)90084-7.
- McDermott, K., Gillbard, E., and Clarke, N., 2015, From basalt to skeletons – the 200 million-year history of the Namibian margin uncovered by new seismic data: Firstbreak, v. 33, p. 77−85, https://doi.org/10.3997/1365-2397.33.12.83748.
- Mercolli, I., Briner, A.P., Frei, R., Schönberg, R., Nägler, T.F., Kramers, J., and Peters, T., 2006, Lithostratigraphy and geochronology of the Neoproterozoic crystalline basement of Salalah, Dhofar, Sultanate of Oman: Precambrian Research, v. 145, p. 182–206, https://doi.org/10.1016/j.precamres.2005.12.002.
- Milanković, M., 1998, Canon of Insolation and the Ice-Age Problem (English translation of the 1941 Serbian Edition by D. Stefanović with biographical preface by N.K. Pantić): Serbian Academy of Sciences and Arts, Belgrade, 634 p.
- Miller, R.McG., 1997, The Owambo Basin of northern Namibia, in Selley, R.C., ed., African Basins: Elsevier, Amsterdam, p. 237−268, https://doi.org/10.1016/S1874-5997(97)80014-7.
- Mills, B., Watson, A.J., Goldblatt, C., Boyle, R., and Lenton, T.M., 2011, Timing of Neoproterozoic glaciations linked to transport-limited global weathering: Nature Geoscience, v. 4, p. 861−864, https://doi.org/10.1038/NGEO1305.
- Moores, E.M., 1991, The Southwest U.S.—East Antarctica (SWEAT) connection: a hypothesis: Geology, v. 19, p. 425−428, https://doi.org/10.1130/0091-7613(1991)0193C0425:SUSEAS3E2.3.CO;2.
- North, G.R., Cahalan, R.F., and Coakley Jr, J.A., 1981, Energy balance climate models: Reviews of Geophysics, v. 19, p. 91−121, https://doi.org/10.1029/RG019i001p00091.
- Opdyke, B.N., and Wilkinson, B.H., 1990, Paleolatitude distribution of Phanerozoic marine ooids and cements: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 78, p. 135−148, https://doi.org/10.1016/0031-0182(90)90208-O.
- Partin, C.A., and Sadler, P.M., 2016, Slow net sediment accumulation sets snowball Earth apart from all younger glacial episodes: Geology, v. 44, p. 1019−1022, https://doi.org/10.1130/G38350.1.
- Peucker-Ehrenbrink, B., and Fiske, G.J., 2019, A continental perspective of the seawater 87Sr/86Sr record: a review: Chemical Geology, v. 510, p. 140−165, https://doi.org/10.1016/j.chemgeo.2019.01.017.
- Phillips, O.M., 1970, On flows induced by diffusion in a stably stratified fluid: Deep-Sea Research, v. 17, p. 435−443, https://doi.org/10.1016/0011-7471(70)90058-6.
- Pollard, D., and Kasting, J.F., 2004, Climate−ice sheet simulations of Neoproterozoic glaciation before and after collapse to Snowball Earth, in Jenkins, G.S., McMenamin, M.A.S., McKay, C.P., and Sohl, L., eds., The Extreme Proterozoic: Geology, Geochemistry, and Climate: American Geophysical Union, Washington, DC, Geophysical Monograph Series 146, p. 91−105, https://doi.org/10.1029/146GM09.
- Popper, K., 1976, Unended Quest: An Intellectual Autobiography: Routledge, London, 328 p.
- Pruss, S.B., Bosak, T., Macdonald, F.A., McLane, M., and Hoffman, P.F., 2010, Microbial facies in a Sturtian cap carbonate, the Rasthof Formation, Otavi Group, northern Namibia: Precambrian Research, v. 181, p. 187−198, https://doi.org/10.1016/j.precamres.2010.06.006.
- Ramme, L., and Marotzke, J., 2022, Climate and ocean circulation in the aftermath of a Marinoan snowball Earth: Climate of the Past, v. 18, p. 759−774, https://doi.org/10.5194/cp-18-759-2022.
- Rankama, K., 1973, The Late Precambrian glaciation, with particular reference to the Southern Hemisphere: Journal and Proceedings of the Royal Society of New South Wales, v. 106, p. 89−97, https://doi.org/10.5962/p.361007.
- Reusch, H., 1891, Skuringsmaerker og moraenegrus eftervist I Finnmarken fre en periode meget aeldre end “istiden” [Glacial striae and boulder-clay in Norwegian Lapponie from a period much older than the last “ice-age”]: Norges Geologiske Undersøgelse, v. 1, p. 78−85 (English summary p. 97−100).
- Rice, A.H.N., Viehmann, S., Peng, Y.B., and Bao, H.M., 2024, Sedimentary environment of basal Ediacaran barite growth on Baltica in E. Finnmark, N. Norway, and subsequent dissolution/reprecipitation: Precambrian Research, v. 406, no. 107384, https://doi.org/10.1016/j.precamres.2024.107384.
- Rieu, R., Allen, P.A., Etienne, J.L., Cozzi, A., and Wiechert, U., 2006, A Neoproterozoic glacially influenced basin margin succession and ‘atypical’ cap carbonate associated with bedrock palaeovalleys, Mirbat area, southern Oman: Basin Research, v. 18, p. 471−496, https://doi.org/10.1111/j.1365.2006.00304.x.
- Rignot, E., and Mouginot, J., 2012, Ice flow in Greenland for the International Polar Year 2008−2009: Geophysical Research Letters, v. 39, no. L11501, https://doi.org/10.1029/2012GL051634.
- Rodgers, J., 1957, The distribution of marine carbonate sediments: a review, in Le Blanc, R.J., and Breeding, J.G., eds., Regional Aspects of Carbonate Deposition: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, Special Publication No. 5, p. 2−14.
- Rooney, A.D., Macdonald, F.A., Strauss, J.V., Dudás, F.Ö., Hallmann, C., and Selby, D., 2014, Re−Os geochronology and coupled Os−Sr isotope constraints on the Sturtian snowball Earth: Proceedings of the National Academy of Sciences USA, v. 111, p. 51−56, https://doi.org/10.1073/pnas.1317266110.
- Rooney, A.D., Strauss, J.V., Brandon, A.D., and Macdonald, F.A., 2015, A Cryogenian chronology: Two long-lasting synchronous Neoproterozoic glaciations: Geology, v. 43, p. 459−462, https://doi.org/10.1130/G36511.1.
- Rose, C.V., Swanson-Hysell, N.L., Husson, J.M., Poppick, L.N., Cottle, J.M., Schoene, B., and Maloof, A.C., 2012, Constraints on the origin and relative timing of the Trezona δ13C anomaly below the end-Cryogenian glaciation: Earth and Planetary Science Letters, v. 319−320, p. 241−250, https://doi.org/10.1016/j.epsl.2011.12.027.
- Rose, C.V., Maloof, A.C., Schoene, B., Ewing, R.C., Linnemann, U., Hofmann, M., and Cottle, J.M., 2015, The end-Cryogenian glaciation of South Australia, in Murphy, J.B., Hildebrand, R.S., and Halverson, G.P., eds., Stirring the Pot: A Celebration of the Career of Paul F. Hoffman: Geological Association of Canada, Geoscience Canada Reprint Series 11, p. 113−150.
- Rothman, D.H., Hayes, J.M., and Summons, R.E., 2003, Dynamics of the Neoproterozoic carbon cycle: Proceedings of the National Academy of Sciences USA, v. 100, p. 8124−8129, https://doi.org/10.1073/pnas.0832439100.
- Sagan, C., and Mullen, G., 1972, Earth and Mars: evolution of atmospheres and surface temperatures: Science, v. 177, p. 52−56, https://doi.org/10.1126/science.177.4043.52.
- Schermerhorn, L.J.G., 1974, Late Precambrian mixtites: glacial and/or nonglacial?: American Journal of Science, v. 274, p. 673−824, https://doi.org/10.2475/ajs.274.7.673.
- Schmidt, P.W., and Williams, G.E., 1995, The Neoproterozoic climatic paradox: Equatorial palaeolatitude for Marinoan glaciation near sea level in South Australia: Earth and Planetary Science Letters, v. 134, p. 107−124, https://doi.org/10.1016/0012-821X(95)00106-M.
- Schopf, J.W., 2021, Precambrian paleobiology: precedents, progress, and prospects: Frontiers in Ecology and Evolution, v. 9, no. 707072, https://doi.org/10.3389/fevo.2021.707072.
- Schrag, D.P., and DePaolo, D.J., 1993, Determination of δ18O of seawater in the deep ocean during the Last Glacial Maximum: Paleoceanography and Paleoclimatology, v. 8, p. 1−6, https://doi.org/10.1029/92PA02796.
- Sellers, W.D., 1965, Physical Climatology: University of Chicago Press, 272 p.
- Sellers, W.D., 1969, A global climatic model based on the energy balance of the Earth–atmosphere system: Journal of Applied Meteorology and Climatology, v. 8, p. 392−400, https://doi.org/10.1175/1520-0450(1969)0083C0392:AGCMBO3E2.0.CO;2.
- Sepúlveda, J., Wendler, J.E., Summons, R.E., and Hinrichs, K.-U., 2009, Rapid resurgence of marine productivity after the Cretaceous−Paleogene mass extinction: Science, v. 326, p. 129−132, https://doi.org/10.1126/science.1176233.
- Shields, G.A., 2005, Neoproterozoic cap carbonates: a critical appraisal of existing models and the plumeworld hypothesis: Terra Nova, v. 17, p. 299−310, https://doi.org/10.1111/j.1365-3121.2005.00638.x.
- Stern, R.J., 1994, Arc assembly and continental collision in the Neoproterozoic East African orogen: Implications for the consolidation of Gondwanaland: Annual Review of Earth and Planetary Sciences, v. 22, p. 319−351, https://doi.org/10.1146/annurev.ea.22.050194.001535.
- Stommel, H.M., 1987, A View of the Sea: A Discussion Between a Chief Engineer and an Oceanographer About the Machinery of the Ocean Circulation: Princeton University Press, Princeton, NJ, 184 p.
- Sumner, D.Y., Kirschvink, J.L., and Runnegar, B.N., 1987, Soft-sediment paleomagnetic fold tests of late Precambrian glaciogenic sediments [abstract]: EOS, American Geophysical Union Transactions, v. 68, p. 1251.
- Swanson-Hysell, N.L., Zhang, Y.M., Macdonald, F.A., Koran, I., Tasistro-Hart, A.R., and Jay, A.F., 2025, Oman was on the northern margin of a wide late Tonian Mozambique Ocean: Geology, v. 53, p. 909–913, https://doi.org/10.1130/G53450.1.
- Tasistro-Hart, A.R., Macdonald, F.A., Crowley, J.L., and Schmitz, M.D., 2025, Four-million-year Marinoan snowball shows multiple routes to deglaciation: Proceedings of the National Academy of Sciences USA, v. 122, no. e2418281122, https://doi.org/10.1073/pnas.1418281122.
- Tasistro-Hart, A.R., Macdonald, F.A., Crowley, J.L., Schmitz, M.D., and Kylander-Clark, A., 2026, Stable sedimentary dynamics of a deep-sea fan across the Marinoan Snowball Earth glaciation: Geology, v. 54, p. 769−774, https://doi.org/10.1130/G54474.1.
- Thiemens, M.H., 1999, Mass-independent isotope effects in planetary atmospheres and the early Solar System: Science, v. 283, p. 341−345, https://doi.org/10.1126/science.283.5400.341.
- Thiemens, M.H., and Heidenreich III, J.E., 1983, The mass-independent fractionation of oxygen: a novel isotope effect and its possible cosmochemical implications: Science, v. 219, p. 1073−1074, https://doi.org/10.1126/science.219.4588.1073.
- Tziperman, E., Abbot, D.S., Ashkenazy, Y., Gildor, H., Pollard, D., Schoof, C.G., and Schrag, D.P., 2012, Continental constriction and oceanic ice-cover thickness in a Snowball-Earth scenario: Journal of Geophysical Research: Oceans, v. 117, no. C05016, https://doi.org/10.1029/2011JC007730.
- Veizer, J., Ala, D., Azmy, K., Bruckschen, P., Buhl, D., Bruhn, F., Carden, G.A.F., Diener, A., Ebneth, S., Goddéris, Y., Jasper, T., Korte, C., Pawellek, F., Podlaha, O.G., and Strauss, H., 1999, 87Sr/86Sr, δ13C and δ18O evolution of Phanerozoic seawater: Chemical Geology, v. 161, p. 59–88, https://doi.org/10.1016/S0009-2541(99)00081-9.
- Vincent, W.F., and Howard-Williams, C., 2000, Life on snowball Earth: Science Letters, v. 287, p. 2421, https://doi.org/10.1126/science.287.5462.2421b.
- Vincent, W.F., Gibson, J.A.E., Pienitz, R., Villeneuve, V., Broady, P.A., Hamilton, P.B., and Howard-Williams, C., 2000, Ice shelf microbial ecosystems in the High Arctic and implications for life on snowball Earth: Naturwissenschaften, v. 87, p. 137−141, https://doi.org/10.1007/s001140050692.
- Vincent, W.F., Mueller, D., and Bonilla, S., 2004a, Ecosystems on ice: the microbial ecology of Markham Ice Shelf in the High Arctic: Cryobiology, v. 48, p. 103−112, https://doi.org/10.1016/j.cryobiol.2004.01.006.
- Vincent, W.F., Mueller, D., van Hove, P., and Howard-Williams, C., 2004b, Glacial periods on early Earth and implications for the evolution of life, in Seckbach, J., ed., Origins. Cellular Origin, Life in Extreme Habitats and Astrobiology: Springer, Netherlands, v. 6, p. 483−501, https://doi.org/10.1007/1-4020-2522-X_29.
- Voigt, A., 2013, The dynamics of the Snowball Earth Hadley circulation for off-equatorial and seasonal varying insolation: Earth System Dynamics, v. 4, p. 425−438, https://doi.org/10.5194/esd-4-425-2013.
- Voigt, A., Abbot, D.S., Pierrehumbert, R.T., and Marotzke, J., 2011, Initiation of a Marinoan Snowball Earth in a state-of-the-art atmosphere−ocean general circulation model: Climate of the Past, v. 7, p. 249−263, https://doi.org/10.5194/cp-7-249-2011.
- Walker, G., 2003, Snowball Earth: the Story of the Great Global Catastrophe that Spawned Life as We Know It: Crown, New York, 265 p.
- Walker, J.C.G., Hays, P.B., and Kasting, J.F., 1981, A negative feedback mechanism for the long-term stabilization of Earth’s surface temperature: Journal of Geophysical Research Oceans, v. 86, p. 9776−9782, https://doi.org/10.1029/JC086iC10p09776.
- Warren, S.G., Brandt, R.E., Grenfell, T.C., and McKay, C.P., 2002, Snowball Earth: ice thickness on the tropical ocean: Journal of Geophysical Research: Oceans, v. 107, p. 31-1–31-18, https://doi.org/10.1029/2001JC001123.
- Weart, S.R., 2003, The Discovery of Global Warming: Harvard University Press, Cambridge, MA, 228 p.
- Wetherald, R.T., and Manabe, S., 1975, The effects of changing the solar constant on the climate of a general circulation model: Journal of the Atmospheric Sciences, v. 32, p. 2044−2059, https://doi.org/10.1175/1520-0469(1975)0323C2044:TEOCTS3E2.0.CO;2.
- Wharton Jr, R.A., McKay, C.P., Simmons Jr, G.M., and Parker, B.C., 1985, Cryoconite holes on glaciers: BioScience, v. 35, p. 499−503, https://doi.org/10.2307/1309818.
- Williams, G.E., 1993a, History of the Earth’s obliquity: Earth-Science Reviews, v. 34, p. 1−45, https://doi.org/10.1016/0012-8252(93)90004-Q.
- Williams, G.E., 1993b, The enigmatic Late Proterozoic glacial climate: an Australian perspective, in Deynoux, M., Miller, J.M.G., Domack, E.W., Eyles, N., Fairchild, I., and Young, G.M., eds., Earth’s Glacial Record: Cambridge University Press, Cambridge, UK, p. 146−164, https://doi.org/10.1017/CBO9780511628900.012.
- Williams, G.E., 2000, Geological constraints on the Precambrian history of Earth’s rotation and the Moon’s orbit: Reviews of Geophysics, v. 38, p. 37−59, https://doi.org/10.1029/1999RG900016.
- Williams, G.E., Gostin, V.A., McKirdy, D.M., and Preiss, W.V., 2008, The Elatina glaciation, late Cryogenian (Marinoan Epoch), South Australia: sedimentary facies and palaeoenvironments: Precambrian Research, v. 163, p. 307−331, https://doi.org/10.1016/j.precamres.2007.12.001.
- Windley, B.F., 1984, The Evolving Continents, 2nd Edition: John Wiley and Sons, Chichester, UK, 420 p.
- Worsley, T.R., and Kidder, D.L., 1991, First-order coupling of paleogeography and CO2, with global surface temperature and its latitudinal contrast: Geology, v. 19, p. 1161−1164, https://doi.org/10.1130/0091-7613(1991)0193C1161:FOCOPA3E2.3.CO;2.
- Wunsch, C., 1970, On oceanic boundary mixing: Deep-Sea Research, v. 17, p. 293−301, https://doi.org/10.1016/0011-7471(70)90022-7.
- Wunsch, C., 2016, Tides of global ice-covered oceans: Icarus, v. 274, p. 122−130, https://doi.org/10.1016/j.icarus.2016.03.026.
- Yang, J., Jansen, M.F., Macdonald, F.A., and Abbot, D.S., 2017, Persistence of a freshwater surface ocean after a snowball Earth: Geology, v. 45, p. 615−618, https://doi.org/10.1130/G38920.1.
- Yung, Y.L., DeMore, W.B., and Pinto, J.P., 1991, Isotopic exchange between carbon dioxide and ozone via O(1D) in the stratosphere: Geophysical Research Letters, v. 18, p. 13–16, https://doi.org/10.1029/90GL02478.
- Zachos, J.C., Arthur, M.A., and Dean, W.E., 1989, Geochemical evidence for suppression of pelagic marine productivity at the Cretaceous/Tertiary boundary: Nature, v. 337, p. 61−64, https://doi.org/10.1038/337061a0.
- Zhou, C.M., Bao, H.M, Peng, Y.B., and Yuan, X.L., 2010, Timing the deposition of 17O-depleted barite at the aftermath of Nantuo glacial meltdown in South China: Geology, v. 38, p. 903−906, https://doi.org/10.1130/G31224.1.
- Zhou, C.M., Huyskens, M.H., Lang, X.G., Xiao, S.H., and Yin, Q.-Z., 2019, Calibrating the terminations of Cryogenian global glaciations: Geology, v. 47, p. 251−254, https://doi.org/10.1130/G45719.1.
- Zolnai, A.I., Price, R.A., and Helmstaedt, H., 1984, Regional cross section of the Southern Province adjacent to Lake Huron, Ontario: implications for the tectonic significance of the Murray Fault Zone: Canadian Journal of Earth Sciences, v. 21, p. 447−456, https://doi.org/10.1139/e84-048.