The Stratigraphy of the Western American Trias (Classic Reprint)

Where a rock-bed of distinctive charakter is persistent over a wide extent of country, a lithologic correlation would reach as good, and often even better, results than could be obtained from paleontologic data. But outcrops of strata are deceptive, and often apparently continuous beds of the same character turn out to contain a number of different formations. In the western states such lithologic and stratigraphic correlations have...