The Pennsylvanian is an epoch of the Carboniferous period lasting from roughly 325 Ma to 299 Ma (million years ago). As with most other geologic periods, the rock beds that define the period are well identified, but the exact date of the start and end are uncertain by a few million years. The Pennsylvanian is named after the state of Pennsylvania, where rocks from this age are widespread. A division of geologic time less than a period and greater than an age. ... The Carboniferous is a major division of the geologic timescale that extends from the end of the Devonian period, about 359. ... // For other uses, see time scale. ... Annum is a Latin noun meaning year. ... Goldenville Strata exposed at a quarry in Bedford, Canada. ... Official language(s) English, Pennsylvania Dutch Capital Harrisburg Largest city Philadelphia Area  Ranked 33rd  - Total 46,055 sq mi (119,283 km²)  - Width 280 miles (455 km)  - Length 160 miles (255 km)  - % water 2. ...

Generalized geographic map of the United States in Middle Pennsylvanian time.

In North America, where the early Carboniferous beds are primarily marine limestones, it is treated as a full fledged geologic period between the Mississippian and the Permian. In Europe, the Mississippian and Pennsylvanian are one more-or-less continuous sequence of lowland continental deposits and are lumped together as the Carboniferous period. Image File history File links Generalized geographic map of the United States in Middle Pennsylvanian time. ... Image File history File links Generalized geographic map of the United States in Middle Pennsylvanian time. ... The Middle Pennsylvanian is the second of three subepochs of the Pennsylvanian epoch of the Carboniferous period. ... World map showing North America A satellite composite image of North America. ... The Carboniferous is a major division of the geologic timescale that extends from the end of the Devonian period, about 359. ... Limey shale overlaid by limestone. ... The geologic time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth. ... This article is about the geologic period; for the North American culture, see Mississippian culture. ... The Permian is a geologic period that extends from about 299. ... This article is 150 kilobytes or more in size. ...

External links

• http://www.scotese.com/late.htm Provides a picture of the world from this time period.
• http://www.ucmp.berkeley.edu/carboniferous/carboniferous.html Information on stratigraphies, localities, tectonics, and life.
• http://www.palaeos.com/Paleozoic/Carboniferous/Pennsylvanian.htm