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Newly identified Carboniferous units (the Pointe Sawyer and Chemin-des-Pêcheurs formations) in the Gaspé Peninsula, Quebec; implications regarding the evolution of the northwestern sector of the Maritimes Basin

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Abstract:

The Upper Member of the Cannes-de-Roches Formation was recently recognized overlying the Bonaventure Formation in the New Carlisle area, over 100 km southwest of the previously documented exposures of this unit. Moreover, remnants of the La Coulée Formation, which are unconformably overlain by the Bonaventure Formation, have also been recognized underlying, with a similar type of contact, the Lower Member of the Cannes-de-Roches Formation. From this and from facies similarities, the Lower and Middle members of the Cannes-de-Roches Formation are now considered to be equivalent to the Bonaventure Formation. It is proposed to abandon these two member designations and to only keep the Bonaventure Formation. The remaining Upper Member of the Cannes-de-Roches Formation is renamed the Pointe Sawyer Formation. A late Viséan to early Namurian age is attributed to this grey clastic formation from spore analysis. Dark reddish-brown sandstone conformably overlie the Pointe Sawyer Formation in the Mal Bay area. They correspond to the beginning of sedimentation from more distant sources within the regional Carboniferous stratigraphic succession, which was until then characterized by sedimentation from proximal sources. This previously unidentified unit is here referred to as the Chemin-des-Pêcheurs Formation.

Le Membre Supérieur de la Formation de Cannes-de-Roches a récemment été identifié recouvrant la Formation de Bonaventure dans la région de New Carlisle, plus de 100 km au sud-ouest des affleurements qui furent antérieurement documentés pour cette unité. De plus, la couverture résiduelle discontinue de la Formation de La Coulée, recouverte en discordance par la Formation de Bonaventure, a aussi été identifiée sous le Membre Inférieur de la Formation de Cannes-de-Roches, montrant avec celui-ci le même type de contact. L'ensemble de ces faits mis de pair avec la similitude des faciès font que les membres Inférieur et Moyen de la Formation de Cannes-de-Roches sont maintenant considérés comme les équivalents de la Formation de Bonaventure. Il est proposé d'abandonner ces deux membres et de ne conserver que la Formation de Bonaventure. Le Membre Supérieur restant est renommé Formation de Pointe Sawyer. Un âge Viséen tardif à Namurien précoce est attribué à cette formation clastique grise de par l'analyse de spores. Des grès bruns rougeâtres foncés recouvrent de façon concordante la Formation de Pointe Sawyer dans la région de La Malbaie. Ils correspondent au début d'une sédimentation provenant de sources plus distales à l'intérieur de la succession stratigraphique carbonifère régionale, laquelle était jusqu'alors caractérisée par une sédimentation provenant de sources proximales. Cette unité stratigraphique est nouvellement identifiée et est ici définie en tant que Formation du Chemin-des-Pêcheurs.

Document Type: Research Article

Publication date: January 1, 2001

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