Occurrence of the Cambrian trace fossil Oldhamia in southern Québec

Authors

  • Natalie L. Sweet Department of Geological Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada
  • Guy M. Narbonne Department of Geological Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada

DOI:

https://doi.org/10.4138/1991

Abstract

The Saint-Nicolas Formation (Sillery Group) of the Chaudière nappe in southern Québec is a succession of shale and feldspathic sandstone that was deposited in a deep water channel-fan environment. This formation, formerly regarded as unfossiliferous, has now yielded the first confirmed specimens of the trace fossil Oldhamia in Québec. Two ichnospecies are described, O. smithi Ruedemann and O. curvata Lindholm and Casey. The occurrence of the middle-upper Lower Cambrian brachiopod Boisfordia preliosa in the overlying Breakeyville Formation confirms that this occurrence of Oldhamia is Lower Cambrian. RÉSUMÉ La Formation de Saint-Nicolas (Groupe de Sillery) de la nappe de Chaudière, dans le sud du Québec, est une succession de shale et de grès feldspathique qui fut déposie dans un environnement de chenal de cône sous-marin, en eau profonde. Cette formation, auparavant considérée comme non fossilifère, a maintenant fourni les premiers spécimens confirmés de la trace fossile Oldhamia au Quebec. Deux espèces d'ichnofossiles sont décrites, O. smithi Ruedemann et O. curvata Lindholm and Casey. La presence du brachiopode Botsfordia preliosa de la partie moyenne à supérieure du Cambrien inférieur dans la Formation de Breakeyville sus-jacente confirme que cette occurence de Oldhamia est du Cambrien inférieur. [Traduit par la rédaction]

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Published

1993-03-01

How to Cite

Sweet, N. L., & Narbonne, G. M. (1993). Occurrence of the Cambrian trace fossil Oldhamia in southern Québec. Atlantic Geoscience, 29(1). https://doi.org/10.4138/1991

Issue

Vol. 29 No. 1 (1993)

Section

Articles

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