Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Lower Jurassic
Kinds of fossils: Mollusks
Quadrangle or area: McCarthy B-5 quad., Alaska
Shipment No.: A-34-22
Referred by: MacKevett, E. M., Jr.
Report prepared by: Imlay, Ralph W.
Date: 11/30/1964


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Brief statement of problem and remarks (from collector):
These collections are from the lowermost fossiliferous horizons in the upper member of the McCarthy Fm. and probably indicates Hettangian or Sinemurian ages. The two members of the McCarthy Fm. are transistional and their contact is difficult to map with consistency. The main use of the fossil determinations will be to document the lower age(s) of the upper member of the McCarthy Fm.
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64AMk82 (Mesozoic loc. 29118) , Mc Carthy , From transitional zone between lower and upper members of McCarthy Fm. -- Probably best included in upper member. Prevailing rock type for this and other fossils submitted in this request is chalcedony cemented calcarenite or calcilutite. 3,000' S. 22-1/2 deg. E. of Hill 6580 in N. part of quad. Lat. 61 deg. 28'45", long. 142 deg. 37'50" (from transmittal sheet of MacKevett for Imlay E&R report of 11/30/64) [E.M. MacKevett, Jr., 1964. South-central part of SW1/4NW1/4 sec. 35, T. 4 S., R. 15 E., McCarthy (B-5) quadrangle, Wrangell Mountains, southern Alaska. Transistional beds at base of upper member of McCarthy Formation. Early Sinemurian. (from Imlay, 1981, p. 25)]
fragments of ammonites belonging to the family Arietitidae
64AMk84 (Mesozoic loc. 29119) , Mc Carthy , From transitional zone between members of McCarthy Fm. 3,300' S. 22-1/2 deg. E. of Hill 6580. Lat. 61 deg. 21'43", long. 142 deg. 37'46" (from transmittal sheet of MacKevett appended to Imlay E&R report of 11/30/64) [E.M. MacKevett, Jr., 1964. 300 ft (91.5 m) southeast of USGS Mesozoic loc. 29118 in same quarter of a quarter section. Transistional beds at base of upper member of McCarthy Formation. Early Sinemurian. (from Imlay, 1981, p. 25)
fragments of ammonites belonging to the family Arietitidae
Arnioceras
64AMk87 , Mc Carthy , From low in section of upper member of McCarthy Fm. in a region of minor folds. At Hill 6580. Lat. 61 deg. 29'20", long. 142 deg. 38'20" (from transmittal sheet of MacKevett)
undetermined smooth ammonites
fragments of ammonites belonging to the family Arietitidae
64AMk108 (Mesozoic loc. 29121) , Mc Carthy , From low in section of upper member of McCarthy Fm. Stratigraphy complicated by numerous small folds. 40' S. 60 deg. W. of summit of Hill 6580. Lat. 61 deg. 29'20", long. 142 deg. 38'20" (from transmittal sheet of MacKevett appended to Imlay E&R report of 11/30/64) [E.M. MacKevett, 1964. In area of small folds of 40 ft (12 m) S. 60 deg. W. of summit of Hill 6580. NE1/4NE1/4 sec. 34, T. 4 S., R. 15 E., McCarthy (B-5) quadrangle, Wrangell Mountains, southern Alaska. Lower in upper member of McCarthy Formation. Early Sinemurian. (from Imlay, 1981, p. 25)]
fragments of ammonites belonging to the family Arietitidae
probably Arnioceras
DLJ-1 , Mc Carthy , Float from S. side of Hill 6580. Lat. 61 deg. 29'00" - Collected by Dave Jones. Long. 142 deg. 38'30" (from transmittal sheet of MacKevett)
undetermined smooth ammonites
fragments of ammonites belonging to the family Arietitidae