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The Saint-Nicolas Formation (Sillery Group) of the Chaudiere nappe in southern Quebec 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 Quebec. 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.  RESUME  La Formation de Saint-Nicolas (Groupe de Sillery) de la nappe de Chaudiere, dans le sud du Quebec, est une succession de shale et de gres feldspathique qui fut deposie dans un environnement de chenal de cone sous-marin, en eau profonde. Cette formation, auparavant consideree comme non fossilifere, a maintenant fourni les premiers specimens confirmes de la trace fossile Oldhamia au Quebec. Deux especes d'ichnofossiles sont decrites, O. smithi Ruedemann et O. curvata Lindholm and Casey. La presence du brachiopode Botsfordia preliosa de la partie moyenne a superieure du Cambrien inferieur dans la Formation de Breakeyville sus-jacente confirme que cette occurence de Oldhamia est du Cambrien inferieur.   [Traduit par la redaction]

Occurrence of the Cambrian trace fossil Oldhamia in southern Qu&#xE9;bec

Occurrence of the Cambrian trace fossil Oldhamia in southern Québec