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A 1 km2 erosional remnant of the La Coulee Formation, a previously unrecognized stratigraphic unit, has been studied in the Perce area of the Gaspe Peninsula. It unconformably overlies folded Cambrian to Devonian rocks and is unconformably overlain by the mid-Carboniferous Bonaventure Formation. The erosional remnant includes the lowest 60 m of this newly identified formation of unknown thickness. Original sedimentary fades are limited to 50 m of breccia debris flows passing stratigraphically upward into 10m of conglomeratic debris flows. Groundwater calcrete formation has partially or completely transformed the lowest 30 m of the sequence. The depositional environment is interpreted as being related to a proximal continental alluvial fan. The nearby presence of a saline body of water is inferred to account for thick and massive groundwater calcrete formation and water-saturated debris flows in a relatively arid climatic context Most of the formation was eroded prior to deposition of the Bonaventure Formation. However, the basal groundwater calcretes were more widely preserved. They underlie the Bonaventure Formation in most of the Perce area and in the Saint-Elzear area, close to a hundred kilometres to the southwest. Post-sedimentary faulting has affected both the La Coulee and Bonaventure formations.   RESUME  La Formation de La Coulee, une unite stratigraphique nouvellement repertoriee, a ete eudiee a I'interieur d'une masse residuelle de 1 km2 dans la region de Perce en Gaspesie. La sequence recouvre en discordance des roches plissees du Devonien Inferieur et elle est recouverte en discordance par la Formation de Bonaventure qui est attribuee au Carbonifere moyen. La masse residuelle inclue les 60 premiers metres de cette formation nouvellement identifiee et d'une epaisseur inconnue. Les fades sedimentaires originels sont limites a cinquante metres de coulees de debris brechiques, passant a une dizaine de metres de coulees de debris conglomeratiques. La formation d'une calcrete phreatique affecte les premiers 30 metres de la sequence, lesquels sont en partie ou completement transformes. L'environnement sedimentaire est interprete comme etant lie a un cone de dejection continental dans sa partie proximale, mais la presence non-lointaine d'un plan d'eau salde est suggeree pour expliquer la formation de calcretes phreatiques epaisses et massives, ainsi que la saturation en eau des coulees de debris dans un contexte climatique relativement aride. La formation a presqu'entierement ete erodee avant que ne survienne la sedimentation de la Formation de Bonaventure. Toutefois, la base de calcrete a ete plus largement preservee, ce qui fait qu'on la retrouve sous la Formation de Bonaventure preque partout dans la region de Perce ainsi que dans la region de Saint-Elzear, a presqu'une centaine de kilometres au sud-ouest. Des failles post-sedimentaires ont affecte a la fois la Formation de La Coulee et la Formation de Bonaventure.

The La Coul&#xE9;e Formation, a new post-Acadian continental clastic unit bearing groundwater calcretes, Gasp&#xE9; Peninsula, Quebec

The La Coulée Formation, a new post-Acadian continental clastic unit bearing groundwater calcretes, Gaspé Peninsula, Quebec