A period of the Paleozoic era (after the Mississippian and before the Permian), thought to have covered the span of time between 323 and 290 million years ago; also, the corresponding system of rocks. It is named after the state of Pennsylvania in which rocks of this age are widespread and yield much coal. It is the approximate equivalent of the Upper Carboniferous of European usage.
The second of the two Geologic Ages of the Carboniferous Period extending from about 310 to 280 million years ago.
from 310 million to 280 million years ago; warm climate; swampy land
Unit of rocks in the upper Carboniferous, named by American geologist H.D. Regers, working in Pennsylvania .
A period of the Paleozoic era, spanning the time between 325 and 286 million years ago. It is named after the state of Pennsylvania where rocks of this age are widespread.
Pertaining to the Pennsylvanian Period, which began 320 million years ago and ended 290 million years ago.
Geologic period that occurred roughly 286 to 320 million years ago. During this period, the first reptiles and winged insects appear.
the sixth period of teh Paleozoic era, after the Mississippian and before the Permian, characterized by coal-m oil-, and gas-bearing deposits and cyclic sedimentation; Upper Carboniferous. [AHDOS
The Pennsylvanian is an epoch of the Carboniferous period lasting from roughly 325 Ma to 299 Ma (million years ago). As with most other geologic periods, the rock beds that define the period are well identified, but the exact date of the start and end are uncertain by a few million years. The Pennsylvanian is named after the state of Pennsylvania, where rocks from this age are widespread.