ge·o·chem·is·try (je´o-kem?i-stre) noun
The chemistry of the composition and alterations of the solid matter of the earth or a celestial body.
— ge´o·chem?i·cal (-i-k?l) adjective
— ge´o·chem?i·cal·ly adverb
— ge´o·chem?ist noun
Excerpted from The American Heritage Dictionary of the English Language, Third Edition Copyright © 1992 by Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V., further reproduction and distribution restricted in accordance with the Copyright Law of the United States. All rights reserved.
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biostratigraphy - American Heritage Dictionary
... ·ra·phy Listen: [ b -str -t g r -f ] n. The study of the spatial and temporal distribution of fossil organisms, often interpolated with radiometric, geochemical, and paleoenvironmental information as a means of dating rock strata. Back to Search Back < biostatistics biosynthesis > The American Heritage ...
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bi·o·stra·tig·ra·phy Listen: [ b-str-tgr-f ]
n.
The study of the spatial and temporal distribution of fossil organisms, often interpolated with radiometric, geochemical, and paleoenvironmental information as a means of dating rock strata.
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One of the "Big Five"
Scientists recognize a number of mass extinctions (extinction events that far exceed background extinction rates and are not taxonomically restricted). Five of these were particularly severe: the terminal Ordovician, Late Devonian, terminal Permian, terminal Triassic, and terminal Cretaceous. There is general agreement that four of these "Big Five" events were relatively restricted in duration (i.e., <1-5 million years). The timing and duration of the Late Devonian mass extinction(s), however, is subject to considerable debate and a variety of interpretations.
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