Abstract

Lithologic and regional stratigraphic relations of the Silurian System are described and summarized for representative sections from major outcrop areas of the Gaspe Peninsula. A restored isopach map reveals three principal tectonic elements which have influenced regional facies variations: Central Gaspe trough, St. John arch, and Southern Gaspe volcanic trough. Thicknesses range from 500 feet in the east to possibly 20,000 feet in the south, suggesting a spoon-shaped eastern terminus of subsidence in the Appalachian geosyncline. Four stratigraphic names (La Force and Black Cape Formations and Baldwin and Cedar Barn Volcanic Members of St. Leon Formation) are proposed and some changes made.

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