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Figure 2 Correlation chart showing position of key units within the Pennsylvanian Subsystem. Global and provincial stage boundaries and ages in millions of years (Ma) are from Gradstein et al. (2012)

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current21:20, 17 July 2020Thumbnail for version as of 21:20, 17 July 20201,819 × 2,181 (429 KB)ILSTRAT (talk | contribs)
18:13, 29 June 2020Thumbnail for version as of 18:13, 29 June 20201,500 × 1,799 (1.08 MB)ILSTRAT (talk | contribs)