Triassic-Jurassic "Red Beds" of the Rocky Mountain Region

Abstract

A correlation table and distribution map of the Jurassic and Triassic red formations of the Rocky Mountains and adjacent regions furnishes background for discussion of correlation and origin of the "red beds." No worth-while basis for the separation of the upper red beds from the lower was found. Vertebrate fossils occur in several members, but are of little value in correlation. Various characteristics indicate marine origin for the major part of the red beds and subaerial origin for other parts. The discussion is confined to the red formations investigated by the writer, and conclusions concerning origin apply only to those formations.