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and relatively short
Lepisosteus was found in the Green River Formation of southwest Wyoming and parts of Colorado and Utah
New 26Al/10Be dating suggests they are in the range of 680
Mioplosus is one of the rarer and more sought after species from this location
the extant horseshoe crabs are often considered to be living fossils
Selenite, 28 specimens per flat Posters and relatively short28 Specimens of Argonite Per Flat In 2x2 Inch Boxes. Selenite is a form of the mineral Gypsum (Hydrated Calcium Sulfate CaSO4 2(H2O). These crystals of Selenite are of a rare needle like variety. Some Selenite crystals are up to 50 feet long. Gypsum is one of the more common minerals in sedimentary environments. It is a major rock forming mineral that produces massive beds, usually from precipitation out of highly saline waters. Since it forms easily
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