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Didymograptus denticulatus Berry
YPM 20252 Early Ordovician, Marathon Ls. Didymograptus bifidus zone, upper Marathon, 14.5 ft below Marathon top, section XVIII, bed of Alsate Creek, 3 mi W of Picnic Picnic Grounds & 0.1 S54W of Marathon, Brewster Co., Texas, USA. Collector: Berry, W.B. |
| J.R. Barbour, photo |
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