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{{#default_form:Entry}}[[file:Penn carbondale 4-1.jpg|250px|{{file:Penn carbondale 4-1.jpg}}|thumb]]
[[file:Penn carbondale 4-1.jpg|250px|{{file:Penn carbondale 4-1.jpg}}|thumb]]

Revision as of 21:07, 21 December 2020

Figure 4-1. Chart showing the development of the Pennsylvanian classification in the Illinois Basin. From the Tri-State Committee (2001). Used courtesy of the Tri-State Committee.