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Your search for “"billings shale"” gave approximately 3 results:
Image: Pseudogygites lantimarginatus
Image: Triarthrus rougensis
Image: Triarthrus spinosus
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"A fossil hunter needs sharp eyes and a keen search image, a mental template that subconsciously evaluates everything he sees in his search for telltale clues. A kind of mental radar works even if he isn't concentrating hard.", Richard E. Leakey (1992)
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Black River-Trenton Brachiopoda Cheirocystis Cobourg Cooper Crinoids Echinoderms Fossils Gatineau Hull Isotelus Triarthrus Triarthrus canadensis Triarthrus spinosus Trilobita abundantly analysis animal area billings formation billings shale canada cannot classes conclusion corals diagnostic divisions eatoni echinoderm fauna forms genera generalized identification interior limestone most north america number ontario ottawa plate poorly pseudogygites pseudogygites latimarginatus reflected represented several species specimens spinosus stromatoporoids structure themselves trilobite upon upoon usually valves
