Some of the more informative sites on the www for rocks of Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian age.
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Virtual Silurian Reef
Arkansas, Ouachitas, Structure, Stratigraphy, and Sedimentology of Paleozoic Rocks
Illinois, Mazon creek, Pennsylvanian, Francis Creek Shale fossils.
Kentucky, Kentucky River, Ordovician.
Maryland, Sidelong Hill, Mississippian, structural and sedimentary geology.
Nevada, Early Cambrian Fossils In Western Nevada
Nevada, Ordovician Fossils In The Toquima Range
New York, Mohawk River Valley, Ordovician sedimentology and tectonism.
Texas, The Permian Reef Complex (Delaware Basin) of West Texas
Wisconsin, Illinois, Silurian reefs, palaeoenvironmental reconstruction, sedimentology and palaeontology
Newquay, Turbidites of the Welsh Coast Silurian