Image: Polygnathus Pa elements
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Description: 8. Polygnathus sp., Pa element, upper view, reworked Late Devonian to Early Mississippian morphotype, X140. 10. Polygnathus sp., Pa element, upper view, reworked Late Devonian to Early Mississippian morphotype, 93RS–79a, X140. 11. Polygnathus sp., Pa element, upper view, reworked Late Devonian to Early Mississippian morphotype, 93RS–67, X140.
Title: Polygnathus Pa elements
Credit: http://pubs.usgs.gov/circ/2004/1264/html/trip3/pl1.html
Author: http://pubs.usgs.gov/circ/2004/1264/html/trip3/pl1.html
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License: Public domain
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