Morphology and taphonomy of root and stump casts of the earliest trees (Middle to Late Devonian), Pennsylvania and New York, U.S.A.

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