Publisher's Synopsis
Excerpt from The Mesozoic and Cenozoic Echinodermata of the United States
The remains of Echinodermata are found in Mesozoic deposits at nearly all horizons and at widely separated localities but are much more numerous and characteristic in Cretaceous than in Triassic and Jurassic strata. In several of the Cretaceous formations they are among the most valuable diagnostic fossils, and at a few localities they occur in vast numbers.
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