|
Reference
|
| Title: |
Report on Referred Fossils
,
1965
(09/30)
|
|
Twenty-five collections from nine localities all contain Permian brachiopods. The quality of preservation of the fossils in most of the collections is good, and the entire shipment will be kept in the Paleontology and Stratigraphy Branch's Permo-Carboniferous collections for further reference. The collections have been assigned numbers 21738-PC to 21760-PC (incl) and 21769-PC and 21770-PC. They are grouped by locality for purposes of discussion below. |
| Report by: |
Richard E. Grant
|
| Referred by: |
Earl E. Brabb
|
|
|
|
| | Age: | Permian (middle Permian) |
| Formation: | Tahkandit Limestone |
|
|
|
|
|
| Comment: | Collections from the type Tahkandit beginning 5.5 feet above the base (coll. 21769) all contain Permian brachiopods. The lowest (21769) has Megousia which indicates a mid-Permian age, equivalent to the Leonard or Word of the Southwest, and more likely the Word. Stenocisma spitzbergiana appears 50 feet above the base; this also occurs in the Spirifer Limestone of Spitzbergen, which Gobbett (1963) considers to be somewhat older than Dunbar's central East Greenland fauna. Spiriferella appears 57 feet above the base, along with "Productus" arcticus: This part of the formation may be slightly younger than the lower part. The definitely younger forms, Horridonia and "Liosotella pseudohorrida are not identified confidently below sample 21759 which is 87 feet above the base. These genera are present in sample 21746 which is 280 feet below the top of the formation, and if the formation is about 350 feet thick, it indicates that they appear about 70 feet above the base in the area of the re-defined top, which lies between samples 21758 and 21759 in the type area. |
|
|
|
|
|
| Title: |
Stratigraphy and Paleontology of the Revised Type Section for the Takhandit Limestone (Permian) in East-Central Alaska
,
1971
|
|
The type section for the Takhandit Limestone is revised to include a massive cliff-forming limestone that apparently is displaced by a fault from the type specified by Mertie (1930) as being along a slough of the Yukon River. Some of the limestone and sandstone in the slough section, on the other hand, seems to be repeated by faulting and is herein excluded from the type section. Also excluded are rocks that more properly assigned to the underlying Nation River Formation of Late Devonian age. The Takhandit type section is redefined to include a lower sandstone unit about 75 feet thick and an upper limestone unit about 270 feet thick. The combined thickness of about 345 feet is considerably less than the 527 or 2,065 feet reported previously. Abundant brachiopods from known stratigraphic positions within the Takhandit are illustrated and discussed systematically for the first time. The faunas show affinities to Permian faunas in the Canadian Arctic Archipelago and central east Greenland and are probably correlative with the upper Leonard and lower Guadalupe Provincial Series of the Southwestern United States. |
| Report by: |
Earl E. Brabb
,
Richard E. Grant
|
|
|
|
| | Age: | Early Permian (Early Permian (late Leonard)) |
| Formation: | Tahkandit Limestone (Tahkandit Limestone (Sandstone unit)) |
|
|
|
|
|
| Comment: | 21 ft above base of unit according to Table 1 (p. 8) |
|