Clay Minerals of the Weathered Bedrock Underlying Coastal New York
Pleistocene and Cretaceous sediments of Long Island rest upon a weathered bedrock surface which presumably formed in Late Jurassic or Early Cretaceous time. The great depth of weathering, high proportion of clay constituents, and prevalence of kaolinite in moderately to strongly weathered horizons suggest that the late Mesozoic was a time of higher temperatures and rainfall than those of the present.