Sample Detail of
Sample: Sample No. 64AMk82 -- USGS No. Mesozoic loc. 29118
Locality: Field No. 64AMk82
Description: 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. 22-1/2o E. of Hill 6580 in N. part of quad. Lat. 61o 28'45", long. 142o 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)]
Location: Alaska Quadrangle: Mc Carthy B-5
Township&Range: T4S R15E Section: south-central part of SW1/4NW1/4 sec. 35
Lat.: 61o28'45 " Long.: 142o37'50 "
Reference
Title: Early Jurassic Ammonites from Alaska ,  1981
Report by: Ralph W. Imlay
Age: Sinemurian (early Sinemurian)
Formation: McCarthy Formation
Comment:Locality shown on Figure 2.

Faunal list given in Table 4

Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Arietitid genus undetermined

Title: Report on Referred Fossils ,  1964 (11/30)
Report by: Ralph W. Imlay
Referred by: E. M. MacKevett , Jr.
Age: Sinemurian-Pliensbachian (early Sinemurian - early Pliensbachian)
Formation: McCarthy Formation
Comment:All five collections submitted contain fragments of ammonites belonging to the family Arietitidae which ranges from lower Sinemurian to lower Pliensbachian. The genus Arnioceras of early Sinemurian age occurs in collection 64AMk84 and probably also in 64AMk108. Undetermined smooth ammonites occur in collections DL-J-1 and 64AMK87. As Arnioceras occurs in the transitional beds between the lower and upper members of the McCarthy Formation, the base of the upper member cannot be older than Sinemurian. As yet fossils of Hettangian age have not been found in the McCarthy area.
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids fragments of ammonites belonging to the family Arietitidae