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Reference
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| Title: |
Letter from Norman J. Silberling to Wesley K. Wallace
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1984
(07/31)
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July 31, 1984 Wesley K. Wallace
ARCO Alaska, Inc.
P.O. Box 100360
Anchorage, AK 99510 Dear Wesley, This letter is concerned with eight samples from Alaska described in your letter of April 5. Most of these are Triassic, one is probably Lower Jurassic, and two are somewhere between "probably Paleozoic" and "indeterminate." ....... Give my regards to Mike. |
| Report by: |
Norman J. Silberling
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| Referred by: |
Wesley K. Wallace
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| | Age: | Norian (early late Norian) |
| Formation: | Kamishak Formation (Kamishak Formation, Middle Member) |
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| Comment: | Monotis subcircularis of early late Norian age. Again, this agrees with the occurrence of fossils reported by Detterman and Reed (1980), but to my knowledge this is a new locality. I've never seen any of the Peninsular terrane (including the "Tlikalkila") on the Peninsula. However, from what I read, have been told, and can glean from the Survey's collections, a genetic tie between the Triassic stratigraphy of the Iliamna and Bruin Bay-Ursus Cove areas is permisable, but it is not demonstrated. Upper Norian strata are represented in both areas, and especially if the coarse skeletal debris (as at 83-BB-183) in these sections is interpreted as being a product of turbidite deposition (???), these strata are generally similar in being mainly limestone and fine-grained siliciclastic rocks. As such, they are more like each other than either section is like the upper Norian strata at Puale Bay. All told, these various specks of Triassic in the Peninsular terrane (as defined by its Jurassic igneous rocks) are probably too few and far between to generalize much about their relationships. |
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