Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Probable Mississippian, Permian and Triassic
Kinds of fossils: Hydrozoan, coral, and bryozoans
Quadrangle or area: Nabesna C-5 and Nabesna D-6 quadrangles, Eastern Alaska Range, Alaska
Shipment No.: A-67-13
Referred by: Richter, Donald H.
Report prepared by: Duncan, Helen
Date: 04/19/1968

This report supplements one prepared by Richard E. Grant (3/27/68). The bryozoans in USGS 22391-PC (field no. 67-ARh-75) are similar to those found elsewhere in the Permian of Alaska and support Grant's impression based on the brachiopods. The coral in USGS 22394-PC (field no. 67-ARh-106) belongs to a genus that, so far as known, is confined to the Mississippian. Grant thought that a brachiopod in the same lot was suggestive of Permian age. Additional faunal evidence is needed to resolve the conflict. USGS 29618-M (field no. 67-ARh-158), collected from talus, contains an unusual chaetetoid hydrozoan that I strongly suspect was derived from Triassic rocks.

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67-ARh-75 (22391-PC) , Nabesna , Nabesna D-6 quadrangle. Lat. 62 deg. 48.0'; 143 deg. 31.2'. 0.48 miles N. 73 W. from SW corner sec. 15, T. 12 N., R. 10 E. Base of thin-bedded, sandy limestone. Field assignment: Mankomen Formation (?). Collected by D. H. Richter, 1967.
Hexagonella? sp. indet.
Rhombotrypella sp. indet.
Rhabdomeson sp. indet.
Other indet. rhomboporoid bryozoans
Fenestrate bryozoans, probably fenestellids and mainly with several rows of zooecia on the branches as in Polypora
67-ARh-106 (22394-PC) , Nabesna , Nabesna D-6 quadrangle. Lat. 62 deg. 45.8'; Long. 143 deg. 33.3'. 0.06 miles N. 29 E., from SW corner sec. 4, T. 11 N., R. 10 E. Thin-bedded (1-5') buff-gray fossiliferous limestone. Field assignment: Mankomen Formation (?).
Siphonodendron sp. undet.
67-ARh-158 (29618-M) , Nabesna , Nabesna C-5 quadrangle. Lat. 62 deg. 36.0'; Long. 143 deg. 11.0'. In sec. 33, T. 10 N., R. 12 E., 1.9 miles N. 67 deg. W. of 5930' peak. Specimen in talus below massive limestone.
Lovcenipora? sp.