Pennsylvanian

https://www.wikidata.org/wiki/Q373772

Field Hierarchy

Parent
Biology 36M papers	Geology 10.4M papers	Paleontology 5.5M papers	Geomorphology 976k papers
Structural basin 617k papers
Current
Pennsylvanian 8,291 papers
Child
Cyclothems 620 papers

Trends

Notes

History