Sample Detail of
Sample: Sample No. 79AHr2 -- USGS No. 27509-PC
Locality: Field No. 79AHr2
Description: West side of steep fault(?) valley, 1 mile north of head of northwest-trending bay. Bay is 1/2 mile east of Portage Arm at head of Nuyakuk Lake. Limestone dips 30 degrees S.W., is at least 150' -250' thick. Limestone becomes increasingly tuffaceous upward. Spec. 3 stratigraphically over spec. 2. Overlain by volcanic breccia and thick (1000'+) section of basalt flows.
Location: Alaska Quadrangle: Goodnews Bay D-1
Township&Range: T3S R57W Section: SW1/4, 3
Lat.: 59o55.8 ' Long.: 159o04.5 '
Reference
Title: Report on Referred Fossils ,  1979 (10/04)
[Remark by J. M. Hoare - Problem is the age of the volcanic rocks. The limestone and overlying flows are apparently in a narrow fault block. The limestone is apparently juxtaposed with similar basalt flows exposed on the east side of the narrow fault valley. If there is no fault, limestone and volcanic rocks are interbedded. Contact between limestone and volcanic rock is concealed, but observations made elsewhere show that Permian limestone commonly grades upward into mafic volcanics.
Need the megafossils identified. Would also like to know if there are any Fusilinids.]
Report by: Raymond C. Douglass
Referred by: Joseph M. Hoare
Age: Permian
Comment:This sample has abundant fusulinids resembling those described by Ross 1967 from 300 to 360 ft. above the base of the Tahkandit Formation along the western part of the central Yukon Territory. He described the specimens as Schwagerina jenkinsi and assigned them a Leonardian age.
Dick Margerum has sliced the material provided in several directions exposing many random sections of the fusulinids. On these I cannot see any well developed coniculi, so I would tend to agree with the Ross assignment.
Occurrence(s)
No. Group Name Qty Notes
1 Fusulinids Schwagerina jenkinsi Thorsteinnson

Title: Report on Referred Fossils ,  1979 (11/01)
This report covers 2 collections from the Permian sequence near the head of Nuyakuk Lake. These are particularly important collections because they record fusulinids from near the Thamnosia beds and from a part of Alaska where fusulinids are rare.
[Remark by J. M. Hoare - Problem is the age of the volcanic rocks. The limestone and overlying flows are apparently in a narrow fault block. The limestone is apparently juxtaposed with similar basalt flows exposed on the east side of the narrow fault valley. If there is no fault, limestone and volcanic rocks are interbedded. Contact between limestone and volcanic rock is concealed, but observations made elsewhere show that Permian limestone commonly grades upward into mafic volcanics.
Need the megafossils identified. Would also like to know if there are any Fusilinids.]
Report by: J. Thomas Dutro , Jr.
Referred by: Joseph M. Hoare
Age: Permian
Comment:This assemblage is found in mid-Permian beds in many parts of the Arctic. The age range is thought to be upper Leonard to early Word, in terms of the West Texas sequence. On brachiopods alone, I would suggest a Road Canyon or Lower Word correlation.
Occurrence(s)
No. Group Name Qty Notes
1 Echinoderms echinoderm debris, indet.
2 Bryozoans stenoporoid bryozoans, indet.
3 Brachiopods Neochonetes?
4 Brachiopods Yakovlevia sp.
5 Brachiopods Waagenoconcha? sp.
6 Brachiopods Calliprotonia sp.
7 Brachiopods Thamnosia sp.
8 Brachiopods Neospirifer? sp. (perhaps Septospirifer)
9 Brachiopods Cyrtella? sp.
10 Brachiopods Neophricadothyris sp.