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Fossils: The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock. (Oxford)
Imagine...400 million years ago, before the present Rocky Mountains (USA) were up. They say it was a shallow,
calm sea that extended from present day Canada to the gulf. Corals are the shape of communities of little creatures.
Millions of tiny creatures over millions of years. The land rose up, the sea drained away and today, (where it hasn't been plowed),
you can find fossilized sea floor. The fossils are silica which is why they still exist today.
Fossils, Fossil Molds, Interior Casts Collection and specimen photos by Joel Graham.
Sea Floor. Ok. (micro photo) Key: 4,5
Fossil collection areas in Texas and Oklahoma.
Rhombotrypa, Bryozoan. Ok. Key: 3
Bryozoan-(coral). (micro photo) Key: 3,4
Bryozoan (coral) and Litophora (bivalve) Key: 3,4
Crinoid stem and Glyptorthis Key 3,4
Crinoid Stems, Sea floor. Ok. Key: 3,4
Fossiliferous Limestone. Tx. Key: 9
Mullusk (top) Tx. Key: 9
Mullusk (bottom) Tx. Key: 9
Cross section of worm casings Key: 11
Heart Urchin. Tx. Key: 11 thru 17
Bivalve, Neospirifer Tx. anterior. Key: 7-8
Bivalve, Neospirifer Tx. interior Key: 7-8
Archimedes Cast. in Flint. Tx. Key: 6
Ammonite Cast. Temnocheilus. Key: 6-8
Plant Cast, Limestone. Glen Rose Texas
Fossil Fish, Wy. Key: 10
fossil-sites-Ca
Petrified Wood(s) group 1 Key: 14
Shell-Fossils-Capitola-Ca
Bivalve, Hinge. Interior Cast. Key: 16,17
Bivalve, Top. Interior Cast. Key: 16,17
Petrified Bone, Exterior. Diablo Range, Ca. Key: 17,18
Sedimentary rocks more than 1.6 kilometers thick are attributed to the upper Mi-
ocene to upper Pliocene Purisima Formation in the greater San Francisco Bay area. These
rocks occur as scattered, discontinuous outcrops from Point Reyes National Seashore in
the north to south of Santa Cruz Ca. (U.S.G.S.)
Identification Sources: The Audubon Society Field Guide to North American Fossils. Geological Survey of Wyoming- Paleontology of the Green River Formation. Bulletin 63 Dinosaur Valley State Park, Glen Rose Texas. Firefly Guide to Minerals Rocks and Fossils. Geology of the San Francisco Bay region. Geology of the Sierra Nevada.
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