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Stratigraphic range: Upper Pennsylvanian (Gzhelian)
Kinds of fossils: trilobites
Quadrangle or area:
Shipment No.:
Referred by: Blodgett, Robert B.
Report prepared by: Hahn, Gerhard
Date: 11/01/1980

To:
Dr. R.B. Blodgett
Oregon State University
Department of Geology
USA - Corvallis, Oregon 97331

1st November 1980

Dear Dr. Blodgett!

Surely you know that Dr. Chamberlain has sent to me your trilobites from Alaska. I have studied them, and I can give you some information concerning their stratigraphical occurrence. Among the specimens of loc. 79WG113 I was able to identify the species Brachymetopus pseudometopina Gauri & Ramovs, 1964 (or a species closely related to the named taxon). This species comes from the Uppermost Carboniferous (Gzhelian) of the Karawanken Mountains in Yugoslavia and Austria. There I suppose that loc. 79WG113 should be group with the Upper Pennsylvanian (Missourian or Virgilian) better than the Mississippian! The trilobite from loc. 77WG203 are so badly preserved that a determination is difficult. Are I allowed to prepare them? Perhaps this will help to win some new information.

The occurrence of Br. pseudometopina in Alaska is very interesting and unexpected, worthy to be published. If you are interested I will write a short paper, photograph the specimens and send the text and plate to you. You can add a notice on the geology and correct my English, and then send the manuscript to the "Journal of Paleontology" for publication. Do you agree?

Yours sincerely,

Prof. Dr. Gerhard Hahn
Philipps-Universitat Marbug
Institut fur Geologie und Palaontologie
Universitatsgebiet Lahnberge
D-3550 Marburg/Lahn

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79WG113 , Mc Grath , Rocks at this locality are siliceous-cemented mudstone which is exposed as talus rubble. Locality coordinates: Lat. 62 deg. 05.4'N, Long. 155 deg. 11.3' W; NW1/4 NE1/4 NW1/4, sec. 17, T23N, R32W, McGrath A-5 quadrangle, 1:63,360 scale, 1954 edition. From interbedded fine-grained, siliceous-cemented, clastic rocks and limestones that form the uppermost beds within an unnamed argillite and chert unit, whose total thick probably exceeds 600 m (approx. 2,000 ft). Abundant bryozoans, brachiopods and pelecypods are also found at the same locality. (description from Hahn et al., 1985). [Dutro E&R report of 8/14/80 provides following description: Alaska, McGrath A-5 quad.; NW 1/4 NE 1/4 NW 1/4 sec. 17, T. 23 N., R. 32 W.; silicified limestone lens within uppermost part of unnamed chert-argillite unit. Collector: W. Gilbert, 1979.]
Brachymetopus pseudometopina Gauri and Ramovs, 1964 (or a species closely related to the named taxon)
77WG203 , Mc Grath , Alaska, McGrath A-5 quad.; precise locality not given. Collector: W. Gilbert, 1977. (description from Dutro E&R report of 8/14/80)
badly preserved trilobites