Lower Carboniferous Sedimentary Rocks 1n Southwestern Newfoundland and their Relations to Similar Strata • In Western Cape Breton Island

CIM Bulletin, 1964

The Carboniferous sedimentary rocks of southwestern Newfoundland merit investigation because of petroleum, salt and gypsum possibilities and indications of base metallization along the equivalent of the Horton-Windsor contact. In this paper, Lower Mississippian (Anguille) strata are divided into three formations: (1) the Cape John below, (2) the Snakes Bight and (3) the Seacliffs. A correlation between these formations and the Craignish, Strathlorne and Ainslie formations of the Horton group in western Cape Breton Island is suggested. The criteria for the Anguilles division are essentially lithological, but preliminary study of included spore assemblages suggests more precise interformational correlations between Anguille and Horton sequences. The re-measured lower portion of the type section of the Codroy group is presented to define more clearly the stratigraphic position of numerous gypsum and limestone beds. Because of rapid facies changes within the Codroy group a simplified two-fold division into upper and lower units is proposed on the grounds of differing gross lithology. This change in terminology facilitates the subdivision of Codroy beds in areas removed from the type section. A correlation of the Codroy group with the Windsor and Canso groups in Nova Scotia is shown, and a brief description of Upper Carboniferous strata is included

Mots Clés: Bay St. Georges Carboniferous Area, gypsum, limestone, sandstone, siltstone, Conglomerate, Conglomerates, Correlation, formation, Gypsum, limestone, Newfoundland, Sandstone, Shale, Shales