Pennsylvanian. During the Pennsylvanian Period, widespread swamps laid down the thick beds of dead plant material that today constitute most of the world's coal. Lasting some 33 million or so years, the Late Carboniferous or Pennsylvanian age was the high point of stem tetrapod evolution, especially during the Bashkirian and Moscovian epochs. During this time the first reptiles and synapsids evolved and quickly diversified.
UT Department of Environmental Sciences
St. Clair, PA
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
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