|
Undet. Annelida: Problematica
YPM 36982 Middle Pennsylvanian, Desmoinesian, Carbondale Fm, Francis Creek Shale Mbr. Mazon Creek, Grundy Co., Illinois. USA. Collector: Strong, S.S. |
| J.R. Barbour, photo |
|
|
Undet. Annelida: Problematica
YPM 36982 Middle Pennsylvanian, Desmoinesian, Carbondale Fm, Francis Creek Shale Mbr. Mazon Creek, Grundy Co., Illinois. USA. Collector: Strong, S.S. |
| J.R. Barbour, photo |
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