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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.
The title of this work would not lead the reader to expect what he will find; valuable notices on mineralogy, agriculture, arts, and manufactures, in the midst of light and lively sketches of manners, places of amusement, &c. Reise durch Sacksen. Von N.G. Leske. Leips. 1785. 4to. Natural history and economy. Beobachtungen uber Natur und Menschen. Von F.E. Lieberoth. Frankfort, 1791. 8vo.
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