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GeoRef Subject
Archaeopteris
Donets Basin
Adams County Pennsylvania
Catskill Formation
Famennian
clastic rocks
Commonwealth of Independent States
Devonian
Frasnian
igneous rocks
Middle Devonian
Europe
Filicopsida
paleosols
Perry County Pennsylvania
Pennsylvania
New York
Plantae
Pteridophyta
Russian Federation
sedimentary rocks
tuff
Upper Devonian
sandstone
Schoharie County New York
Paleozoic
United States
volcanic rocks
pyroclastics
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