Triarthrus spinosus & Triarthrus eatoni
Hint: spinosis has spines
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Time itself
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| Edited | 18th May 2019, 10:26 pm |
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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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Asaphida Asaphidae Billings Shale formation Black River-Trenton Brachiopoda Ceraurus Cheirocystis Cobourg Cooper Crinoids Echinoderms Fossils Gatineau Hull Iapetus Ocean Isotelus Natural Capital Region Ordovician Ottawa Presentation Triarthrus Triarthrus canadensis Triarthrus eatoni Triarthrus rougensis Triarthrus spinosus Trilobita UV flashlight analysis animal area billings formation billings shale blastoid canada conclusion divisions eatoni echinoderm echinoids fluorescence forms genera interior limestone most north america number ontario plate pseudogygites pseudogygites latimarginatus reflected several species spinosus structure trilobite upon upoon valves
