Walchia

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1	The Pennsylvanian-Permian Boundary in South-Central Oklahoma Add to Reading List Source URL: digital.library.okstate.edu Language: English - Date: 2009-01-09 16:56:37 Unconformity Arbuckle Mountains Historical geology Geological history of Earth Geology Conifers Walchia
2	Color profile: Disabled Composite Default screen Add to Reading List Source URL: www.geo.arizona.edu Language: English - Date: 2005-02-15 17:57:18 Permian Carboniferous Rotliegend Paleozoic Walchia Euramerica Dimetrodon Pennsylvanian Historical geology Geology Phanerozoic