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In the North American continent, on the other hand, where the Upper Cretaceous formations are so widely developed, true white chalk, in the ordinary sense of that term, does not exist. Ananchytes ovatus, Leske. White chalk, upper and lower. a. Side view. b. Micraster cor-angumum, Leske. Galerites albogalerus, Lam. Marsupites Milleri. Mant.
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