Reference Detail of

Letter from W.B.N. Berry to William P. Brosge
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Stratigraphic range: Ordovician
Kinds of fossils: Graptolites
Quadrangle or area: Demarcation Point
Shipment No.: No Data
Referred by: Brosge, William P.
Report prepared by: Berry, William B. N.
Date: 10/19/1971

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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).
Orthograptus of the O. quadrimucronatus type