Lower Ordovician Fillmore Formation

Millard County, Utah

Paleontology field trip participants stand atop a characteristic ledge of limestone in the lower Ordovician Juab Limestone (third-youngest member of the Pogonip Group) in western Millard County, Utah, a number of miles east of the eastern border of White Pine County, Nevada. Many invertebrate types are well represented in the Juab, with brachiopods, gastropods, cephalopods, trilobites, conodonts, solitary sponges, and graptolites especially characteristic of the predominantly calcium carbonate geologic accumulation. Photograph courtesy Dave Smith; I edited and processed the images through photoshop.

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