Sample: |
Sample No. 79WG113
|
Locality: |
Field No. 79WG113
|
Description: |
Rocks at this locality are siliceous-cemented mudstone which is exposed as talus rubble. Locality coordinates: Lat. 62o 05.4'N, Long. 155o 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.] |
Location: |
Alaska Quadrangle: Mc Grath A-5 Township&Range: T23N R32W Section: NW1/4, NE1/4, NW1/4 sec. 17 Lat.: 62o05.4 ' Long.: 155o11.3 ' |
|
|
Reference
|
Occurrence(s) |
No. |
Group |
|
Name |
Qty |
Notes |
1 |
Trilobites |
|
Brachymetopus pseudometopina Gauri and Ramovs |
|
|
2 |
Trilobites |
|
Pseudophillipsia? (Carniphillipsia) sp. A |
|
|
3 |
Trilobites |
|
Pseudophillipsia? (Carniphillipsia) sp. B |
|
|
4 |
Echinoderms |
|
echinoderm debris, indet. |
|
identified by J.T. Dutro, Jr. |
5 |
Echinoids |
|
Archeocidaris? sp. |
|
identified by J.T. Dutro, Jr. |
6 |
Bryozoans |
|
fenestrate bryozoans, indet. (molds and casts) |
|
identified by J.T. Dutro, Jr. |
7 |
Bryozoans |
|
Polypora spp. |
|
identified by J.T. Dutro, Jr. |
8 |
Bryozoans |
|
stenoporoid bryozoans, indet. (molds and casts) |
|
identified by J.T. Dutro, Jr. |
9 |
Brachiopods |
|
Septacamera? sp. |
|
identified by J.T. Dutro, Jr. |
10 |
Brachiopods |
|
Waagenites? sp. |
|
identified by J.T. Dutro, Jr. |
11 |
Brachiopods |
|
Chonetinella sp. |
|
identified by J.T. Dutro, Jr. |
12 |
Brachiopods |
|
chonetids, indet. |
|
identified by J.T. Dutro, Jr. |
13 |
Brachiopods |
|
Anidanthus sp. |
|
identified by J.T. Dutro, Jr. |
14 |
Brachiopods |
|
Terrakea? sp. |
|
identified by J.T. Dutro, Jr. |
15 |
Brachiopods |
|
productoid fragments, indet. |
|
identified by J.T. Dutro, Jr. |
16 |
Brachiopods |
|
Reticularia? sp. |
|
identified by J.T. Dutro, Jr. |
17 |
Brachiopods |
|
martinioid indet. |
|
identified by J.T. Dutro, Jr. |
18 |
Brachiopods |
|
punctate spiriferoid, indet. |
|
identified by J.T. Dutro, Jr. |
19 |
Bivalves |
|
Acanthopecten? sp. |
|
identified by J.T. Dutro, Jr. |
20 |
Bivalves |
|
pectenoid pelecypods, indet. |
|
identified by J.T. Dutro, Jr. |
21 |
Bivalves |
|
pelecypod fragments, indet. |
|
identified by J.T. Dutro, Jr. |
|
|
Title: |
letter
,
1980
(11/01)
|
|
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 |
Report by: |
Gerhard Hahn
|
Referred by: |
Robert B. Blodgett
|
|
|
| Age: | Gzelian (Gzhelian) |
Formation: | Unnamed |
|
|
|
|
|
Comment: | Among the specimens of loc. 79WG113 I was able to identify the species Brachymetopus pseudometopinaGauri & 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. Therefore I suppose that loc. 79WG113 should be grouped with the Upper Pennsylvanian (Missourian or Virgilian) better than the Mississippian! |
|
|
Title: |
Report on Referred Fossils
,
1980
(08/14)
|
|
This report covers 2 collections made by Wyatt Gilbert in the McGrath A-5 quadrangle, west-central Alaska. Both collections are from fine-grained clastic rocks with abundant fenestrate bryozoans, brachiopods, and a few pelecypods. The brachiopods are definitely Permian in age and the association with a variety of bryozoans, including POLYPORA, is characteristic of some parts of the lower Permian sequences elsewhere in the Alaska (for example, the east-central Alaska Range in the lower argillite member of the Eagle Creek Formation, and the Rampart Group of the Tanana-Livengood area). There are differences between the brachiopod assemblages in these two collections. Collection 77WG203, including the large CHONETINA?, RHYNCHOPORA? AND SPIRIFERELLA sp. may be a bit younger than the other, although differences may reflect environmental factors. In any case, they both appear to be Lower Permian. |
Report by: |
J. Thomas Dutro
, Jr.
|
Referred by: |
Robert B. Blodgett
,
Wyatt G. Gilbert
|
|
|
| Age: | Early Permian |
Formation: | Unnamed (Unnamed chert-argillite unit) |
|
|
|
|
|
Comment: | There are differences between the brachiopod assemblages in these two collections. Collection 77WG203, including the large CHONETINA?, RHYNCHOPORA? AND SPIRIFERELLA sp. may be a bit younger than the other, although differences may reflect environmental factors. In any case, they both appear to be Lower Permian. |
|
|
Title: |
letter
,
1980
(08/26)
|
|
U.S. Geological Survey, Branch of Paleontology and Stratigraphy, 345 Middlefield Road, MS 15, Menlo Park, California 94025 August 26, 1980 To: Mr. Robert B. Blodgett, Department of Geology, Oregon State University, Corvallis, Oregon 97331 Dear Mr. Blodgett: I have examined your specimens, 79WG113, for microfossil and coral fragments. The limestone has been recrystallized and there are no algae or foraminifera. The corals are solitary forms and are not well preserved. They appear to be belong to the genus Faberophyllum sp. indet. They are of late Meramecian or earliest Chesterian, Mississippian age. Under separate cover I am returning your specimens. Sincerely, Augustus K. Armstrong |
Report by: |
Augustus K. Armstrong
|
Referred by: |
Robert B. Blodgett
|
|
|
| Age: | Meramecian-Chesterian (late Meramecian or earliest Chesterian) |
|
|
|
|
|
|
|
|
|
|