Sample Detail of
Sample: Sample No. 84SK205A -- USGS No. 9950-CO
Locality: Field No. 84SK205A
Description: Thin-bedded, argillaceous marble from 4 miles south of head of Agashashok River and above Middle Fork of Squirrel River, sec. 22, R. 25 N., R. 12 W., lat. 67o 33.6 min., long. 161o 20.4 min., Baird Mountains C-5 quadrangle; submitted as top of continuous section (84SK205A to 84SK210A) of Baird Group of unknown age.
Location: Alaska Quadrangle: Baird Mts C-5
Township&Range: T25N R12W Section: Sec.22
Lat.: 67o33.6 ' Long.: 161o20.4 '
Reference
Title: Report on Referred Fossils ,  1985 (06/14)
Report by: J. Thomas Dutro , Jr.
Referred by: Susan M. Karl , Julie A. Dumoulin , Jeanine Schmidt , Inyo Ellersieck
Age: Cambrian-Ordovician (Cambrian - Ordovician, probably Late Cambrian)
Formation: Baird Group
Comment:4.4 kg of rock was processed (46 g of +20 mesh and 128 g of 20-200 mesh insoluble residue): NO CONODONTS WERE RECOVERED, but the heavy-mineral concentrate yielded: 1 pedicle valve of ANGULOTRETA? sp.

This acrotretid morphotype is characteristic of the Cambrian and Ordovician. ANGULOTRETA is restricted to the Upper Cambrian. This collection of the one pedicle valve of an acrotretid brachiopod of possible Late Cambrian age is of the same probable age as field no. 84SK223A, from 3.8 km southwest that also produced only one pedicle valve of an acrotretid.

Age: Cambrian-Ordovician, probably Late Cambrian.

Occurrence(s)
No. Group Name Qty Notes
1 Brachiopods 1 pedicle valve of Angulotreta? sp.