Permian fossils collected from the Tankandit limestone along the Yukon River and its tributaries between Eagle and Circle Collier 1902 Brooks 12 Martin 82 2441 2446 Martin 83 1800b 5842 Globigerina? sp. The fossils of these collections were determined by Charles Schuchert. • Coliection misplaced, but fossils known to be of Permian age. Permian fossils collected from the Tahkandit limestone along the Yukon River and its tributaries between Eagle and Circle—Continued Productus longispinus. vi Xi Xiiii Spirifor ef. S. cameratus . The fossils of these collections were determined by Charles Schuchert. 2444 and 2444a. Yukon River above Circle. (The description is inadequate but almost surely represents the Nation River locality.) Collector, J. E. Spurr. 2AC55. Yukon River, north bank 3 miles above mouth of Seventymile River. Collector, A. J. Collier. (No Permian rocks are known at this locality; either the locality is wrongly recorded, or the faunal and age determinations are incorrect.) 2443. Yukon River, west bank 3 miles above Nation River. Collector, A. J. Collier, 2445. Limestone mountain 11/2 miles northeast from mouth of Nation River. Collector, A. J. Collier. Collier 1902. (Ambiguous wording in description of locality. Interpreted by the writer to mean float found along the Yukon at the mouth of Washington Creek.) Collector, A. J. Collier. 2441. Yukon River, west bank 3 miles above Nation River. Collector, Arthur Hollick. Brooks 12. Yukon River, southwest bank 1 mile below Tatonduk River. Collector, A. H. Brooks. (No Permian rocks are known at this locality, and the writer is inclined to believe that this locality also is wrongly recorded.) 2446. Yukon River, south bank 6 miles above Nation. Collector, A, H. Brooks. (This collection probably comes from the Trout Creek locality.) 2447. Yukon River, north limb of anticline opposite station 14. Collector, A. H. Brooks. (This collection is undoubtedly from the north side of the limestone band at Nation River.) 2448. Yukon River three-quarters of a mile below Coal Creek. Collector, A. H. Brooks. 427. Michigan Creek, west side about 6 miles from mouth. Collector, J. B. Mertie, jr. 428. Michigan Creek, west side about 3 miles from mouth. Collector, J. B. Mertie, jr. Martin 82. Yukon River, south bank 2 miles above Nation River. Collector, G. C. Martin. Martin 83. Yukon River, south bank 112 miles above Nation River. Collector, G. C. Martin. 1799, 1799a, and 1799b. Yukon River, southwest bank 8 miles above Nation River. Collector, Eliot Blackwelder. 1800, 1800a, and 1800b. Yukon River, west bank above Nation River. Collector, Eliot Blackwelder. 1801. Yukon River, south bank just below Coal Creek. Collector, Eliot Blackwelder. 2437, 2437a, and 2437b. Yukon River, west bank opposite mouth of Nation River. Lowest part of middle outcrop of Permian sandstone, with 15 feet of shales, but from several horizons. Collector, G. H. Girty. 2438. Yukon River, west bank opposite mouth of Nation River. Middle outcrop of Permian limestone, above lots 2437, 2437a, and 2437b, but in transition beds below main white limestone. Collector, G. H. Girty. 2439. Same general locality as 2438, but from a more shaly stratum just above 2438. Collector, G. H. Girty. 2440. Same general locality as 2438, but from base of a heavy limestone 10 feet above 2439. Collector, G. H. Girty. 2440a. Same general locality as 2438, but from the very top of the white limestone as exposed. Collector, G. H. Girty. 2442, 2442a, 2442b, 2442c, and 2442d. Yukon River, west bank opposite mouth of Nation River. Talus from several horizons. Collector, G. H. Girty. 2543. Yukon River, south bank three-quarters of a mile below mouth of Coal Creek. Collector, G. H. Girty. 2549. Yukon River, west bank opposite mouth of Nation River. Various horizons in lowest outcrop of Permian limestone. Collector, G. H. Girty. 5839, 5839a, 5839b, and 5839c. Yukon River, southwest bank about 294 miles upstream from Nation. The positions of these four localities in the Permian stratigraphic section were closely determined. Collector, J. B. Mertie, jr. 5840. Southeast side of valley of Nation River about 1 mile northeast of Yukon River. Collector, J. B. Mertie, jr. 5841. Yukon River, southwest bank about three-quarters of a mile downstream from mouth of Coal Creek. Collector, J. B. Mertie, jr. 5842. Southeast side of valley of Nation River about 5 miles northeast of Yukon River. Collector, J. B. Mertie, jr. In addition to the fossils tabulated, at least three of the fossil collections made by Cairnes along the international boundary are also now recognized by Girty as Permian. These are given below. (For explanation of numbers, see p. 48.) XVI k 15: Chonetes aff. C. variolatus. Aviculipecten? sp. Polypora sp. Rhynchopora cf. R. nikitini. Chonetes cf. C. ostiolatus. Rhynchopora cf. R. nikitini. This lower Permian horizon is correlated paleontologically by Girty with the Artinskian of Tschernyschew and is known at many localities in Alaska. In northern Alaska this horizon has been recognized by Maddren 74 along the international boundary in the valley of the Firth River, not far from the Arctic. Farther west in Arctic Alaska rocks of the same horizon in the Canning River region have been described by Leffingwell 76 under the name Sadlerochit sandstone. This formation, which consists there of 300 feet of sandstone, was described by Leffingwell as Pennsylvanian but is now placed by Girty in the lower Permian. Maddren 4 found this lower Permian horizon represented by a calcareous tuff lying at the top of a lava 74 Maddren, A. G., unpublished notes. * Lefingwell, E. de K., The Canning River region, northern Alaska : U. S. Geol. Survey Prof. Paper 109, pp. 113–115, 1919. |
