|
Reference
|
| Title: |
Report on Referred Fossils
,
1954
(11/08)
|
|
The fossils from the Naknek formation belong in the zone of Aucella rugosa (Fischer). There is no representative of the older zone characterized by Aucella concentrica (Fischer)(equals A. bronni or the still older zone characterized by species of Cardioceras. The latter has never been found on the Alaska Peninsula, but the zone of A. concentrica is widespread. In the Talkeetna Mountains the base of the zone with Aucella rugosa is near the middle of the Naknek in the southern exposures but occupies the base of the formation in the northernmost exposures. Similar overlap relationships should be considered in future field work on the Naknek formation of the Alaska Peninsula. The fossils from the Kaguyak formation are of Campanian or Maestrichtian age and are younger than any fossils found in the Chignik formation in the southern part of the Alaska Peninsula. In the Talkeetna Mountains fossils identical with those in the Kaguyak formation occur at the top of the siltstone member of the Matanuska formation just below the highest sandstone member. The smooth compressed pachydiscid ammonite from locality 54AKe41 is good evidence of a postion high in the Upper Cretaceous sequence. The small Inoceramus with sharp, equally-spaced ribbing that is compared with I. kusiorensis Nagao and Matumoto is likewise common the high Cretaceous beds. Several years ago I examined an excellent collection from the Kaguyak area made by John Hazzard and associates of the Union Oil Company. A copy of that report can be sent to you if you so desire. |
| Report by: |
Ralph W. Imlay
|
| Referred by: |
A. S. Keller
|
|
|
|
| | Age: | Campanian-Maastrichtian (Campanian or Maastrichtian) |
| Formation: | Naknek Formation |
|
|
|
|
|
| Comment: | The fossils from the Kaguyak formation are of Campanian or Maestrichtian age and are younger than any fossils found in the Chignik formation in the southern part of the Alaska Peninsula. In the Talkeetna Mountains fossils identical with those in the Kaguyak formation occur at the top of the siltstone member of the Matanuska formation just below the highest sandstone member. The smooth compressed pachydiscid ammonite from locality 54AKe41 is good evidence of a postion high in the Upper Cretaceous sequence. The small Inoceramus with sharp, equally-spaced ribbing that is compared with I. kusiorensis Nagao and Matumoto is likewise common the high Cretaceous beds. |
|