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Many are fossil crusts, in the sense that they relate to past climatic, biologic, and
geomorphic environments and are not forming under present conditions in these
areas. Other types of crust are associated with sub- humid to arid climates, ...
German biologist, microscopist, scientific explorer, and a founder of
micropaleontology — the study of fossil microorganisms. Ehrenberg studied at
the University of Berlin (M.D., 1818) and was associated with the university
throughout his ...
An important constituent of the present- day planktonic (floating) and benthic (
bottom dwelling) microfaunas, foraminiferans have an extensive fossil record that
makes them useful as index fossils in geological dating and in petroleum ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review