the Cretaceous beds are very distinctly divided into three prin- 
cipal stages, viz: 
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special home of Inocerami, Selachians, and gigantic Am- 
monites, 
8. Ripley group: crystalline, sandy limestones, alternatil 
with dark colored glauconitic marls atiadnte finely preserved 
fossils. Thickness 300 to 350 feet. Equivalent of the highest 
bed yA Cretaceous of New J ersey, and doubtless of Hayden s 
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at: gby sand sub-group is distin, 
alr eady stated, b number, hore, of indi 
species of In 
