Pennsylvanian

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

Field Hierarchy

Parent
Biology 36.7M papers	Geology 10.6M papers	Paleontology 5.6M papers	Geomorphology 992k papers
Structural basin 628k papers
Current
Pennsylvanian 8,361 papers
Child
Cyclothems 626 papers

Trends

Notes

History