File:The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world (1908) (14596421279).jpg

Identifier: americanaunivers07newy (find matches)
Title: The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world
Year: 1908 (1900s)
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Subjects: Encyclopedias and dictionaries
Publisher: New York : Scientific American Compiling Dept.
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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s. The time division corre-sponding to a system is here called a period.Periods are grouped to constitute eras, andthese are named according to the condition ofdevelopment of the living forms, except thefirst, the lifeless era. Thus we have the Azoic,lifeless era, the Eozoic, dawn life era (or theProterozoic, fore life era, or .\gnotozoic^ un-known life era), the Paleozoic, ancient life era,the Mesozoic, middle life era, and the Cenozoic,modern life era. Each system is divided into series, some ofwhich have received names that are used alikein Europe, America, and elsewhere whereverthe fossils characteristic of the series are found,while others are identified by name in a par-ticular province only. The Quaternary isdivided into Pleistocene and Recent, the formerterm designating collectively the Glacial epochs.The Tertiary of Europe and North Americaincludes the Eocene, Oligocene, Miocene, andPliocene series, enumerating from earlier tolater. These cover the most familiar cases of >
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MESOZOIC PROTEROIOIC ANOARCMEAN LATER iSNEOUSflOCx! IFprlMartiUi Uiwi-i fn-U-^iin ;cita;ts:. i-S-JsiS .^^ c GEOLOGY names of series in world-wide use; those nameswhich have only provincial use are very manyand their definition and correlation belong tomanuals and special articles. Eras World-wide systems of strata corre- sponding to periods Periods, Geikie*s text of the same names. book, 1885. U. S. Geological Survey usage 1903. Quaternary- 1 RecentPleistocenePlioceneMiocene Tertiary j Oligocene _ (. Eocene Cretaceous Cretaceous Jurassic Jurassic Triassic Triassic Carboniferous ( PermianCarboniferous Devonian Devonian Silurian Silurian Ordovician. . Cambrian Cambrian Algonkian I I Archean Archean Within each series there are many minorsubdivisions which represent conditions in localdistricts of each province, and for these againdistinctly local names must be chosen. Thecommon practice is to give to each such minordivision of a rock sequence the geographicname of a place at or near whi

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