Paleozoic

Definitions

  • WordNet 3.6
    • adj Paleozoic of or relating to or denoting the Paleozoic era
    • n Paleozoic from 544 million to about 230 million years ago
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Webster's Revised Unabridged Dictionary
    • a Paleozoic (Geol) Of or pertaining to, or designating, the older division of geological time during which life is known to have existed, including the Silurian, Devonian, and Carboniferous ages, and also to the life or rocks of those ages. See Chart of Geology.
    • n Paleozoic (Geol) The Paleozoic time or strata.
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Century Dictionary and Cyclopedia
    • Paleozoic In geology, belonging to or constituting a geological formation characterized by the presence of ancient forms of life: applied to the oldest division of the geological series, beginning with the lowest stratified fossiliferous group, and extending upward to the base of the Triassic, or to the top of the Permian. The grand divisions of the Paleozoic are, proceeding upward or to groups later in age, the Silurian, Devonian, Carboniferous, and Permian. (See these words.) Of these the Permian is much the least important. The other divisions have been designated respectively as the “age of mollusks,” the “age of fishes”, and the “age of coal or of land-plants.” The Paleozoic series may, from a paleontological point of view, be properly separated into two great divisions, a newer and an older. The former embraces the Silurian; the latter, the Devonian, Carboniferous, and Permian. The older Paleozoic is distinguished by the great predominance of graptolites, trilobites, and brachiopods, and by the absence of vertebrates; the newer Paleozoic, by the number and variety of the fishes and amphibia, by the disappearance of graptolites and trilobites, and by an extraordinarily developed flora, largely cryptogamic in character, from which a very considerable part of the coal of the globe has been formed. Rocks of Paleozoic age are spread over wide areas. They are especially important in the eastern and northeastern United States and in the Upper Mississippi valley, in which regions they usually form the surface-rock, being covered only with detrital formations of the most recent age. Almost the whole of the bed-rock in New York and Pennsylvania is of Paleozoic age, and here the various groups of this series were studied out by the Geological Surveys of those States from 1834 on. To the labors of Sedgwick and Murchison in Wales and western England, carried on at about the same time with the beginnings of the New York and Pennsylvania Surveys, is due the larger share of the credit of disentangling the complicated structure of a region where the Paleozoic rocks are extensively developed, and it is there that the materials were obtained for the establishment by Murchison of the Silurian and Devonian systems, which, with the Carboniferous and Permian, form the Paleozoic epoch.
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Etymology

Webster's Revised Unabridged Dictionary
Paleo-, + Gr. zwh` life, fr. zh^n to live

Usage

In literature:

The period following on after Archean time is called, by geologists, Paleozoic time.
"The Prehistoric World" by E. A. Allen
Then began a forty-mile ride through a dense Canadian spruce forest over the drift and boulders of the paleozoic age.
"Locusts and Wild Honey" by John Burroughs
There is a laboratory of invertebrate paleontology of Paleozoic age, with a corps of paleontologists.
"Scientific American Supplement, No. 484, April 11, 1885" by Various
You know, back in the Paleozoic Age!
"Ruth Fielding in the Great Northwest" by Alice B. Emerson
Eastward tilting and deposition of Martinsburg shale; oscillations during later Paleozoic time.
"History and Comprehensive Description of Loudoun County, Virginia" by James W. Head
Paleodictyoptera: an ordinal name suggested by Scudder for Paleozoic insects which cannot be assigned to existing orders.
"Explanation of Terms Used in Entomology" by John. B. Smith
Zinc ores of this same general character are also found in Paleozoic rocks (Knox dolomite) in Virginia and Tennessee.
"The Economic Aspect of Geology" by C. K. Leith
The Paleozoic (ancient life) or Primary period is made up of a number of subdivisions.
"Nature's Miracles, Volume 1" by Elisha Gray
The Paleozoic sediments, ranging in age from Cambrian to Permian, occupy the Great Valley, the Valley Ridges and the plateaus still farther west.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 3" by Various
Sometimes, also, this sandstone rests on the edges of the disturbed paleozoic rocks (as seen in the section).
"A Manual of Elementary Geology" by Charles Lyell
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In science:

Stanley, “Paleozoic mass extinctions: Shared patterns suggest global cooling as a common cause,” Am. J.
Simple models of evolution and extinction
Paleozoic and Mesozoic sediments were uncomformably deposited on this uncomformity surface.
Reference Design Project Book: NUSEL-Homestake
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