| Sample: |
Sample No. CEK-776 -- USGS No. Mesozoic loc. 25832
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| Locality: |
Field No. CEK-776
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| Description: |
West Douglas Island [Note by R.B. Blodgett: No further information given in E&R report, however, Kirschner's transmittal sheet indicate that Kirschner (of Standard Oil Co. of California) made this collection on August 10, 1955 and he provides the coordinates of 2.0/1.1 on the Iliamna quadrangle sheet, which is an obvious error as these match with the geographic feature "Douglas Island" as he used it elsewhere. The coordinates indicate Iliamna A-8 quad., but an obvious error]; Mesozoic loc. 25832 on westernmost of two offshore islands 0.6 mile N. 35° E. of mouth of Douglas River. Buchia rugosa (Fischer) and B. mosquensis (von Buch). (description from Imlay and Detterman, 1973, p. 27);[USGS Mes. Cat.: 25832 CEK776. Upper Jurassic Naknek Fm. Iliamna quad., West Douglas Island, Alaskan Pen., Alaska. Coll. by Kirschner, 1955.];C. E. Kirschner, 1955. South side of Kamishak Bay on
west end of Douglas Island, Iliamna (A-3) Quadrangle,
at head of Alaska Peninsula. Naknek Formation. Early Tithonian. (description from Imlay, 1981, USGS PP 1190, p. 27); [Entry in USGS Mesozoic Catalogue (Washington, D.C.): |
| Location: |
Alaska Quadrangle: Iliamna A-3 |
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Reference
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| Title: |
Report on Referred Fossils
,
1955
(11/04)
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These collections that have been submitted have furnished information that should be of interest to many geologists and are well worth keeping in the Survey Collections. Their value would be greater if the locations of the various collections were shown on index maps. These would be filed with the reports and be available for future use by anyone. Such maps would be appreciated, especially for areas in which localities are difficult to describe. [Note: these collections were referred by C.E. Kirschner through George Gates] |
| Report by: |
Ralph W. Imlay
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| Referred by: |
Charles E. Kirschner
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| | Age: | Late Jurassic |
| Formation: | Naknek Formation |
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| Comment: | The upper faunal zone in the Naknek formation is characterized by Aucella mosquensis (von Buch) and Aucella rugosa (Fischer). This zone is overlain near the southern end of the Alaskan Peninsula by the Staniukovich shale which is characterized by Aucella piochi Gabb (Imlay, 1952, G.S.A. Bull, vol. 63, p. 978). The zone of Aucella piochi has been found elsewhere in Alaska in the Nutzotin Mountains (1954, Imlay and Reeside, G.S.A. Bull., vol. 65, p. 235) and on Admiralty Island (1954, Imlay and Reeside, G.S.A. Bull., vol. 65, p. 227). You may recall that Aucella piochii is the most common fossil in the Knoxville formation in California, which formation is thousands of feet thick. These facts emphasize that the Naknek formation does not represent the latest Jurassic. |
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| Title: |
Jurassic Paleobiogeography of Alaska
,
1973
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ABSTRACT: Jurassic marginal seas occupied considerable areas in southern and northern Alaska and in the western part of the Kuskokwim region of southwestern Alaska. They appear to have been absent during late Callovian time, much restricted during Hettangian, Bathonian, early Oxfordian and late Tithonian time, and most extensive during Sinemurian, Bajocian, and late Oxfordian to middle Tithonian time. A large area in central Alaska was probably never covered. A southwestern prolongation of that area from the Talkeetna Mountains westward to the western end of the Alaska Penin- sula was the site of granitic intrusions during late Early Jurassic time and of extensive erosion during Middle and Late Jurassic time. Variations in the rate of uplift of the area of these granitic intrusive rocks may explain why marine transgressions and regressions were at different times in southern than in northern Alaska during the Bajocian and Bathonian. Connection of the northern and southern marginal seas occurred through Yukon Territory and eastern- most Alaska. The Jurassic ammonite succession in Alaska is similar to that in central and northern Europe and northern Asia. In Lower Jurassic beds, it is essentially identical. In Bajocian and in Oxfordian to lower Kimmeridgian beds, the ammonite succession in Alaska differs from that in the other areas mainly by the presence of some genera found only in areas bordering the Pacific Ocean and by the absence of a few genera common in central and northern Europe. In con- trast, the Bathonian rocks of Alaska contain ammonites, such as Arcticoceras, Arctocephalites, and Cranocephalites, that are widespread in the Arctic region but are unknown in central Europe. Comparisons with the Tithonian of Europe are not possible because ammonites of that age, other than Lytoceras and Phylloceras, are not yet known from Alaska. The Alaskan Jurassic ammonites of late Pliensbachian Age and of Bathonian to early Kimmeridgian Age belong mostly to the Boreal realm and have very little in common with Tethyan realm ammonites such as those found in areas bordering the Mediterranean Sea. |
| Report by: |
Ralph W. Imlay
,
Robert L. Detterman
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| | Age: | Kimmeridgian-Tithonian (late Kimmeridgian - early middle Tithonian) |
| Formation: | Naknek Formation |
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| Comment: | Generalized locality shown as locality 18 in figure 8 |
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| Title: |
Late Jurassic Ammonites from Alaska
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1981
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| Report by: |
Ralph W. Imlay
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| | Age: | Tithonian (early Tithonian) |
| Formation: | Naknek Formation |
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| Comment: | Shown as loc. 11 on Fig. 1 and Fig. 7 and Table 6 Phylloceras alaskanum Imlay, n. sp., is associated with Buchia concentrica (Sowerby) at USGS Mesozoic Iocs. 10795, 10817, 25708, 25710, 25713, 25715, 29899, and 24156. It is associated with Buchia mosquensis (Von Buch) at USGS Mesozoic Iocs. 11345, 25832, and 25833 and with B. rugosa (Fischer) at Mesozoic loc. 25832, 25833. (from Imlay, 1981, p. 29) |
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