Tetragraptus approximatus Nicholson

YPM 20276

Early Ordovician, Marathon Ls, Monument Spring Dolomite Mbr. Tetragraptus aproximatus zone, 37-39 ft above isoclinal fold zone in section I beginning on NW limb of a large isoclinal fold, section bearing S65E, 4 mi SW of Marathon, Brewster Co., Texas, USA. Collector: Berry, W.B.

J.R. Barbour, photo

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