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Pennsylvanian Period

Facts about the period
by

C. R.

on 4 October 2012

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Transcript of Pennsylvanian Period

Pennsylvanian Period Began 323 million years ago and ended 290 million years ago. Occurred in Paleozoic Era after the Mississipian. END Climate Hot and humid near the equator with a lot of rain Freezing and arid at poles. The climate varied depending on the location on the Earth. Environment 40% higher oxygen level in
the atmosphere than today. Coal swamps and forests covered most
of the area near the equator. Glaciated areas blanketed the
Northern and Southern poles. Oxygen levels were caused by
the many ferns and plants
that began to grow. Giant insects
like... Organisms Brachiopods Myriapods Bryozoa A variety of animals lived
in the ocean as well as on land. Dragonflies Cockroaches
and Diplovertebron Underwater moss
animal G iant cenipedes and milipedes Lampshelled organisms. Landmasses Laurasia collided with Gondwana to soon
form the supercontinent Pangaea near
the end of the Pennsylvanian. 60 cm amphibian also called meganeura Sea levels rose and fell repeatedly because of melting and freezing of ice. The coal swamps made then are still in use today
for oil. Many fish and shark-like
organisms began to evolve as
well as reptiles and amniote eggs End of Pennsylvanian:
The end of the Pennsylvanian consisted of a mass extinction of invertabrates caused by climate change.
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