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Your search for “"Triarthrus rougensis"” gave approximately 1 result:
Image: Triarthrus rougensis
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"When out fossil hunting, it is very easy to forget that rather than telling you how the creatures lived, the remains you find indicate only where they became fossilized.", Richard E. Leakey (1946)
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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
