Sample Detail of
Sample: Sample No. 85ANS5.5 -- USGS No. 29640-PC
Locality: Field No. 85ANS5.5
Description: Carbonate clast in conglomerate from the McHugh Complex. Plutonic clasts from this area have given K/Ar ages of Jurassic age (150 Ma) and previously dated marbles contained fusulinids of Permian age. Sample from north side of Seward Highway roadcut one-half mile SE of Beluga Point, lat. 61o 01 min., long. 149o 40 min. (description from Harris & Reed, E&R report, Aug. 6, 1985) [limestone clast from a polymictic cobble conglomerate 2 km southeast of the viewing area at Beluga Point, on the north side of the Seward Highway (sec. 32, T. 11 N., R. 2 W., Anchorage A-8 quadrangle). Other clasts in the conglomerate include diorite, gray argillite, sandstone, amphibolite, volcanic porphyry, and white quartz clasts. (description from Nelson and others, 1986, p. 60)]
Location: Alaska Quadrangle: Anchorage A-8
Lat.: 61o01' " Long.: 149o40' "
Reference
Title: Late Paleozoic and Early Jurassic fossil ages from the McHugh Complex ,  1986
Report by: Steven W. Nelson , Charles D. Blome , Anita G. Harris , Katherine M. Reed , Frederic H. Wilson
Age: Meramecian-Morrowan (late Meramecian - very earliest Morrowan)
Formation: McHugh Complex
CAI:Min: 5 - Max: 5.5 (CAI) of 5 to 5.5 indicates that the host rock reached at least 300 deg. to 350 deg. C, probably before incorporation in the McHugh Complex.)
Comment:The indicated age is late Meramecian through very earliest Morrowan. The color alteration index (CAI) of 5 to 5.5 indicates that the host rock reached at least 300o to 350o C, probably before incorporation in the McHugh Complex.
Occurrence(s)
No. Group Name Qty Notes
1 Conodonts one Pa element of Gnathodus bilineatus (Roundy)
2 Conodonts one Pa element of Gnathodus cf. G. girtyi (Roundy)
3 Conodonts three indeterminate bar and blade fragments

Title: Report on Referred Fossils ,  1985 (08/06)
Sample was processed for conodonts in Anchorage, Alaska.
Report by: Anita G. Harris , Katherine M. Reed
Referred by: Steven W. Nelson
Age: Meramecian-Morrowan (late Meramecian - very earliest Morrowan)
CAI:Min: 5 - Max: 5.5 (CAI=5 to 5.5 indicating the host rock reached at least 300 to 350 deg. C.)
Comment:1.1 kg of rock was processed (44 g of +20 mesh and 32 g of 20-200 mesh insoluble residue).

Age: late Meramecian through very earliest Morrowan (=late Late Mississippian through very earliest Early Pennsylvanian)
CAI=5 to 5.5 indicating the host rock reached at least 300 to 350o C.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 Pa element of Gnathodus bilineatus (Roundy)
2 Conodonts 1 Pa element of Gnathodus cf. G. girtyi Roundy
3 Conodonts 3 indet. bar and blade fragments