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GeoRef Subject
Arbuckle Mountains
Graptolithina
Kentucky
Appalachians
North America
Ordovician
Ouachita Mountains
paleoecology
tectonics
West Texas
Middle Ordovician
Oklahoma
Texas
Invertebrata
Northern Appalachians
sea-level changes
structural geology
Paleozoic
Upper Ordovician
stratigraphy
United States
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