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Stratigraphic range: Middle Devonian (middle Eifelian)
Kinds of fossils: conodonts
Quadrangle or area:
Shipment No.:
Referred by: Blodgett, Robert B.
Report prepared by: Savage, Norman M.
Date: /1980

Bob,

Your 79RB8 and 79RB10 conodonts are Polygnathus costatus costatus and indicate a middle Eifelian age.

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79RB8 (10061-SD) , Mc Grath , Long. 155 deg. 09'23"W, Lat. 62 deg. 04'33"N. NE1/4, NW 1/4, NE1/4, NW1/4 sec. 21, T23N, R32W. Approximately 3.0 m (10 ft) thick silicified fossil horizon, the top of which is 101.5 m (333 ft) below the top of the Cheeneetnuk Limestone. (description from Rigby and Blodgett, 1983, p. 774)
Polygnathus costatus costatus
79RB10 (10094-SD) , Mc Grath , Lat. 62 deg. 04'39" N., long. 155 deg. 09'25" W. NE1/4 SW1/4 SE1/4 SW1/4 sec. 16, T. 23 N., R. 32 W., Seward Meridian (McGrath A-5) Quadrangle. Silicified fossil horizon 34 m (113 ft) below top of the Cheeneetnuk Limestone (description from Blodgett and Gilbert, 1983)
Polygnathus costatus costatus