: Paléoclimatologie: Lower Pennsylvanian

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Lower Pennsylvanian

The Lower Pennsylvanian is the lower part of the Pennsylvanian (also known as Upper Carboniferous or Late Carboniferous) which is, on the ICS geologic timescale, the younger of two subperiods (or upper of two subsystems) of the Carboniferous Period. It lasted from roughly 323.2 million years ago to 298.9 million years ago. As with most other geochronologic units, the rock beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain by a few hundred thousand years. The Pennsylvanian is named after the U.S. state of Pennsylvania, where the coal-producing beds of this age are widespread. (Adapted from : https://en.wikipedia.org/wiki/Pennsylvanian_(geology))

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