71ABe430D
, Demarcation Point
, Demarcation Pt. Quad; 69 deg. 26.5' N., 141 deg. 00' W. Collectors: W. P. Brosge, R. L. Detterman. Isoclinal syncline? of black slate-phyllite with very thin beds of limonitic fine-grained sandstone. Abundant worm trails at one or two horizons. 71ABe430D and 71ABe431E. One specimen of biserial graptolite 71ABe430D submitted on a separate request. 500+ ft. Road River Formation (in Neruokpuk terrain).
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a robust diplograptid type belonging to either the genus Orthograptus ....
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.... or the genus Diplograptus.
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