Report on Referred Fossils |
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| Stratigraphic range: |
Jurassic |
| Kinds of fossils: |
Mollusks |
| Quadrangle or area: |
Iniskin Peninsula, Cook Inlet, Alaska |
| Shipment No.: |
A-58-1 |
| Referred by: |
Detterman, Robert L.
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| Report prepared by: |
Imlay, Ralph W.
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| Date: |
01/22/1958 |
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Your collections from the Gaikema member of the Tuxedni formation are rather meagre for an age determination. They contain, however, the same varied pelecypod faunule as has been found in other seasons. The collections made by Hartsock, Kellum, Kirschner, Miller and others suggest that the Gaikema member is equivalent to the lower part of the European zone of Otoites sauzei and that the underling siltstone member is equivalent to the zone of Sonnina sowerbyi. The collections from the Fitz Creek member are excellent. They contain an assemblage that is correlated with the Otoites sauzei zone (See Arkell, 1956, Jurassic Geology of the World, p. 542). The only other item of interest is your assignment of collection 57ADt13 to the basal part of the Naknek formation. The ammonites present, however, belong to a compressed subgenus of Cadoceras that is common in the upper part of the Chinitna formation on Chinitna Bay and Tuxedni Bay. This part of the Chinitna formation probably disappears southward toward Iniskin Bay. At least the ammonites from the top of the Chinitna formation near Iniskin Bay are identical with those found in the middle part of the formation on Chinitna Bay. You may want to check this relationship next summer.
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| User Note module to be added |
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57ADt1
(Mesozoic loc. 26602)
, Iliamna
, Gaikema member of Tuxedni Formation, lower part on Tonnie Creek. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Gaikema member; lower part; medium-bedded graygreen sandstone with siltstone interbeds, Tonnie Creek; Coords: 9.64-11.98; 59 deg. 45'20"N; 153 deg. 14'10"W; Section 8, T.5S.-R.23W."][Shown as locality 46 on Pl. 3 of Detterman and Hartsock, 1966]
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57ADt6
(Mesozoic loc. 26601)
, Iliamna
, Gaikema member of Tuxedni Formation, lower middle part along Fitz Creek. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Gaikema member lower middle part; soft chocolate brown coquina sandstone; road cut along Fitz Creek; Coords: 10.7-13.55; 59 deg. 46'40"N; 153 deg. 12'30"W. Section 4, T.5S-R.23W."][Shown as locality 48 on Pl. 3 of Detterman and Hartsock, 1966]
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Inoceramus lucifer Eichwald
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57ADt11
(Mesozoic loc. 26600)
, Iliamna
, Gaikema member of Tuxedni Formation, middle part on Gaikema Creek. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Gaikema member of Tuxedni formation; massive middle part greenish sandstone and conglomerate; Gaikema Creek; Coords: 11.15-15.62; 59 deg. 48'30"N, 153 deg. 11'35"W."][Shown as locality 59 on Pl. 3 of Detterman and Hartsock, 1966]
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57ADt12
(Mesozoic loc. 26599)
, Iliamna
, "Fitz Creek" member of Tuxedni Formation. Lower part sandstone and congl. interbeds, Gaikena Creek. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Fitz Creek member, lower part sandstone and conglomerate siltstone interbeds; Gaikema Creek, Coords: 10.85-15.65; 59 deg. 48'30"N, 153 deg. 12'05"W."][Shown as locality 69 on Pl. 3 of Detterman and Hartsock, 1966]
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Zemistephanus richardsoni (Whiteaves)
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Stephanoceras (Skirroceras) sp.
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Normannites cf. N. mackenzii (McLearn)
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N. cf. N. canadensis (McLearn)
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57ADt2
(Mesozoic loc. 26597)
, Iliamna
, "Fitz Creek" member of Tuxedni Formation. Middle Part. Tonnie Creek. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Fitz Creek member; middle part; greenish-gray nodular weathering siltstone with interbeds of sandstone; Tonnie Creek; Coords 9.4-12.5. 59 deg. 45'25"N, 153 deg. 14'30"W; Section 8, T.5S-R23W."][Shown as locality 77 on Pl. 3 of Detterman and Hartsock, 1966]
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Chondroceras defontii (McLearn)
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57ADt15
(Mesozoic loc. 26598)
, Iliamna
, "Fitz Creek member of Tuxedni Formation. Middle part. Fitz Creek. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Fitz Creek member; middle, dark-gray silty shale with limestone concretions; upper Fitz Creek, Coords: 8.66-10.47; 59 deg. 44'N., 153 deg. 15'45"W. Section 19, T.5S-R.23W."][Shown as locality 78 on Pl. 3 of Detterman and Hartsock, 1966]
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Zemistephanus richardsoni (Whiteaves)
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Pseudotoites carlottensis (Whiteaves)
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57ADt8
(Mesozoic loc. 26594)
, Iliamna
, "Fitz Creek" member of Tuxedni Formation. Upper 150 feet. South Shore Chinitna Bay. (description from Imlay E&R report of 1/22/58; Shipment A-58-1))[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Fitz Creek member of Tuxedni formation; upper 150 feet; greenish sandstone lenses and concretions in siltstone; south shore Chinitna Bay; Coords: 14.52-16.35; 59 deg. 49'05"N, 153 deg. 05'55"W."][Shown as locality 113 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59 deg. 49'03" N., 153 deg. 06'02" W. - note that this differs somewhat from coordinates given in transmittal sheet of Detterman cited above.]
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57ADt9
(Mesozoic loc. 26595)
, Iliamna
, "Fitz Creek" member of Tuxedni Formation. Upper part. South Shore Chinitna Bay. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Fitz Creek member; upper part blue-gray siltstone with sandstone interbeds and limy concretions; south shore Chinitna Bay; Coords: 13.93-15.9; 59 deg. 48'40"N, 153 deg. 07'W."][Shown as locality 114 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59 deg. 48'59" N., 153 deg. 06'11" W. - note this differs somewhat from the coordinates given in transmittal sheet of Detterman cited above.]
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57ADt10
(Mesozoic loc. 26596)
, Iliamna
, "Fitz Creek" member of Tuxedni Formation. Upper part, but below 57ADt9. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Fitz Creek member; upper part but below 57ADt9; lithology similar; south shore Chinitna Bay; Coords: 13.6-15.75; 59 deg. 48'30"N; 153 deg. 07'25"W."][Shown as locality 107 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59 deg. 48'52" N., 153 deg. 06'22" W. - note this differs somewhat from the coordinates cited above that were given in Detterman's transmittal sheet.]
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57ADt5
(Mesozoic loc. 26593)
, Iliamna
, Bowser member of Tuxedni Formation. 20 feet below lowermost sandstone on Cliff Creek. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Bowser member of Tuxedni formation; 20 feet below lowermost sandstone; rust-brown weathering silty shale; Cliff Creek; Coords: 11.58-13.21, 59 deg. 46'20"N, 153 deg. 11'W, Section 3, T.58S-R.23.W."][Shown as locality 131 on Pl. 3 of Detterman and Hartsock, 1966][Imlay, 1982, provides the following description: "R.L. Detterman, 1957. Iniskin Peninsula, on Cliff Creek near USGS Mesozoic loc. 21313, lat. 59 deg. 49'20" N., long. 153 deg. 11'00" W. Twist Creek Siltstone, 200 ft (61 m) above base." (Note by R.B. Blodgett: the lat. 59 deg. 49'20" is incorrect; judging by the map location in Detterman and Hartsock, the earlier given of 59 deg. 46'20" appears to be correct)]; [26593 R. L. Detterman, 1957. Inisikin Peninsula on Cliff Creek near Mes loc. 21313. Bowser member of the Tuxedni formation, 200 feet above base. (description from Imlay, 1961, p. 469)]; [USGS Mes. Cat.: 26593. 57ADt5. Bowser Member of Tuxedni Fm. Middle? Jurassic. 20' below lowermost ss & about 200' above Cynthia Falls Mem. Rust brown weathering silty sh. on Cliff Ck. Coords. 11.58-13.21. Lat. 59° 46'20", Long. 153° 11'00" W., Sec. 3, T. 5 S., R. 23 W., Iniskin Pen., Alaska. Coll. by Detterman, 1957]
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57ADt13
(Mesozoic loc. 26590)
, Iliamna
, Chinitna Formation. Labeled basal 100 feet of Naknek fm. South Shore Chinitna Bay. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Naknek formation; basal 100 feet; dark greenish to gray siltstone with interbeds of yellowish green sandstone, limestone lenses and concretions; Coords: 17.2-17.48; 59 deg. 49'55"N, 153 deg. 01'25"W. South shore Chinitna Bay."][Shown as locality 274 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59 deg. 50'03" N., 153 deg. 01'02" W. - this differs drastically from that given above in transmittal sheet of Detterman.]
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Cadoceras (Stenocadoceras) multicostatum Imlay
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57ADt14
(Mesozoic loc. 26591)
, Iliamna
, Chinitna Formation. Labeled upper 50 feet of Chinitna formation. South Shore Chinitna Bay. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Chinitna formation; upper 50 feet, olive gray siltstone; south shore Chinitna Bay; Coords: 17.04-17.45, 59 deg. 49'55"N, 153 deg. 01'55"N, 153 deg. 01'30"W."][Shown as locality 278 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 59 deg. 50'04" N., 153 deg. 01'06" W. - this differs drastically from that given above in Detterman's transmittal sheet]
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57ADt4
(Mesozoic loc. 26592)
, Iliamna
, Chinitna Formation. Middle of lower part on upper part of Bowser Creek. (description from Imlay E&R report of 1/22/58; Shipment A-58-1)[Transmittal sheet of Detterman, dated 12/18/57 provides following description: "Chinitna formation; middle of lower part is concretions in blue-gray silty clay shale and clay stone; upper Bowser Creek; Coords: 9.95-9.37, 59 deg. 43'05"N, 153 deg. 10'35"W. Section 29, T.5S-R.23W."[Shown as locality 222 on Pl. 3 of Detterman and Hartsock, 1966]
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Inoceramus ambiguus Eichwald
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