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Bookmark or Share- Pennsylvanian Subperiod | Natural History MuseumPennsylvanian forests and swamps were home to a rich diversity of animals, particularly winged insects. Insects and other arthropods were the main herbivores (vertebrates had not yet evolved the complex digestive strategies needed to eat plants). This Period is known as the Age of Amphibians due to their numbers and variety.
- Pennsylvanian Subperiod | Carboniferous, Coal Age, FloraPennsylvanian Subperiod, second major interval of the Carboniferous Period, lasting from 323.2 million to 298.9 million years ago. The Pennsylvanian is recognized as a time of significant advance and retreat by shallow seas. Many nonmarine areas near the Equator became coal swamps during the Pennsylvanian. These areas are mined for coal today.
- Pennsylvania - WikipediaPennsylvania is the fifth-most populous state in the United States, with over 13 million residents as of the 2020 United States census. [4] The state is the 33rd-largest by area and has the ninth-highest population density among all states.
- Pennsylvania | Capital, Population, Map, Flag, Facts, & HistoryPennsylvania | Capital, Population, Map, Flag, Facts, & History | Britannica. Home Geography & Travel States & Other Subdivisions. Pennsylvania. state, United States. Also known as: Commonwealth of Pennsylvania, Keystone State. Written by. E. Willard Miller. Emeritus Professor of Geography, The Pennsylvania State University.
- Pennsylvanian Period—323.2 to 298.9 MYA - U.S. National Park ServicePennsylvanian Time Span. Date range: 323.2 million years ago–298.9 million years ago. Length: 24.3 million years (0.54% of geologic time) Geologic calendar: December 6 (9 PM)–December 8 (7 AM) (1 day, 10 hours) Pennsylvanian age fossil tracks, Grand Canyon National Park, Arizona. NPS image.
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