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Flysch Pebble Conglomerate of the Cap-des-rosiers Formation (Ordovician), Gaspe Peninsula, Quebec

1972; Society for Sedimentary Geology; Volume: Vol. 42; Linguagem: Inglês

10.1306/74d7267b-2b21-11d7-8648000102c1865d

1938-3681

K. R. Aalto,

Geological Modeling and Analysis

ABSTRACT A bed of well sorted limestone pebble conglomerate one meter thick and over 175 m long exposed among Ordivician argillites at Cap-des-Rosiers contains from base upwards 7 zones, each with distinct depositional features: Zone 1--carbonate sandstone infilling sole marks; Zone 2--imbricated coarse-grained pebble conglomerate; Zone 3--coarse grained pebble conglomerate without preferred clast orientation; Zone 4--coarse-grained pebble conglomerate with clasts orientated parallel to the Zone 4-Zone 5 contact; Zone 5--fine-grained pebble conglomerate with clasts oriented parallel to the Zone 4-Zone 5 contact; Zone 6--fine-grained pebble conglomerate without preferred clast orientation; Zone 7--sandy fine-grained pebble conglomerate. The zonation was produced during gravel flow emplacement b the falling in of sand between pebbles, the size separation of coarse- and fine-grained conglomerate, deformation during deposition along the interface between coarse- and fine-grained conglomerate, and suspension settling of sand. from and overriding current of water.