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Pennsylvanian
(redirected from Late Carboniferous)

   Also found in: Dictionary/thesaurus, Wikipedia 0.01 sec.
Pennsylvanian
1. of the state of Pennsylvania
2. (in North America) of, denoting, or formed in the upper of two divisions of the Carboniferous period (see also Mississippian (sense 2)), which lasted 30 million years, during which coal measures were formed
3. an inhabitant or native of the state of Pennsylvania
4. the. the Pennsylvanian period or rock system, equivalent to the Upper Carboniferous of Europe

Pennsylvanian [¦pen·sal¦vā·nyən]
(geology)
A division of late Paleozoic geologic time, extending from 320 to 280 million years ago, varyingly considered to rank as an independent period or as an epoch of the Carboniferous period; named for outcrops of coal-bearing rock formations in Pennsylvania.


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The oldest "true spider", like the ones seen today, dates from the late Carboniferous period that ended about 300 million years ago, though Professor Selden said that true spiders may have existed earlier but have not yet been discovered.
It has been found in rocks ranging in age from Lower Cambrian (515 million years) to Late Carboniferous (320 million years), and geographically across four continents: in China, South Korea, the Czech Republic, Bolivia, British Columbia, Ontario, Quebec, and many parts of the United States.
The late Carboniferous into the Permain period followed with a change in landscape, the Coventry and Kenilworth areas becoming closer to the sea with sand dunes, rivers and lagoons and even desert.
 
 
 
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