Shallow marine Paleodictyon from the Upper Ordovician Georgian Bay Formation of southern Ontario

Auteurs-es

  • D. C.A. Stanley Department of Geology, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada
  • R. K. Pickerill Department of Geology, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada

DOI :

https://doi.org/10.4138/1994

Résumé

Two specimens, and a possible third, of the ichnotaxon Paleodictyon are documented from shallow-water marine strata of the Upper Ordovician Georgian Bay Formation of southern Ontario. Its occurrence indicates that previous suggestions of a post-Early Cambrian palaeoenvironmental retreat of Paleodictyon into deeper water require some modification. Instead, the operative migratory process, at least to the Late Ordovician and possibly even longer, was one of expansion and not of retreat. RÉSUMÉ Deux spécimens, et possiblement un troisieme, de la trace fossile Paliodictyon sont reconnus dans des strates marines peu profondes de la Formation de Georgian Bay de l'Ordovicien supérieur du sud de l’Ontario. Sa présence indique que les suggestions précédentes d'une retraite paléo-environnementale post-Cambrien précoce de Paliodictyon en eaux plus profondes nécessitent quelques modifications. À la place, le processus migratoire operatif, au moins jusqu'à l'Ordovicien tardif et possiblement encore plus longtemps, en était un d'expansion et non de retraite. [Traduit par la rédaction]

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Publié-e

1993-07-01

Comment citer

Stanley, D. C., & Pickerill, R. K. (1993). Shallow marine Paleodictyon from the Upper Ordovician Georgian Bay Formation of southern Ontario. Atlantic Geoscience, 29(2). https://doi.org/10.4138/1994

Numéro

Vol. 29 No. 2 (1993)

Rubrique

Articles

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