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The Pennsylvanian Time Period
The Pennsylvanian is named after the U.S. state of Pennsylvania, where the coal-productive beds of this age are widespread.
The Subdivisions In Order Within the Pennsylvanian period
Youngest- Gzhelian
-Kasimovian
-Moscovian
Oldest- Bashkirian
More About the Time Period...
The division between Pennsylvanian and Mississippian comes from North American stratigraphy. Stratigraphy means the branch of geology concerned with the order and relative position of strata and their relationship to the geological time scale. n North America, where the early Carboniferous beds are primarily marine limestones, the Pennsylvanian was in the past treated as a full-fledged geologic period between the Mississippian and the Permian. The current internationally used geologic timescale of the ICS gives the Mississippian and Pennsylvanian the rank of subperiods, subdivisions of the Carboniferous Period.
The Geology of the
Pennsylvanian
The Pennsylvanian Time Period
We hope you guys enjoyed! Here are some links if anyone ever wants to check out more on the Pennsylvanian Time Period:
- https://en.wikipedia.org/wiki/Pennsylvanian_(geology)#Vertebrates
- http://www.scotese.com/late.htm
- http://www.ucmp.berkeley.edu/carboniferous/carboniferous.html
- http://www.palaeos.com/Paleozoic/Carboniferous/Pennsylvanian.htm
- http://pubs.usgs.gov/imap/i-2768/i2768.pdf
The Pennsylvanian is also known as Upper Carboniferous or Late Carboniferous. The definite time of this time period is uncertain by a few million years, but we know much about it because of its rock beds.
Subdivision of the Carboniferous system according to the ICS.
About The Life During the Pennsylvanian
Fungi: All modern classes of fungi have been found in rocks of Pennsylvanian age.
Vertebrates: Amphibians were diverse and common; some were several meters long as adults! The collapse of the rainforest ecology in the mid Pennsylvanian (between the Moscovian and the Kasimovian) removed many amphibian species that did not survive as well in the cooler, drier conditions. Reptiles, however, prospered due to specific key adaptations.