Alaska Paleontological Database

Sample Detail

of

Sample:	Sample No. 51AHa11a, b, c -- USGS No. Mesozoic loc. 22723
Locality:	Field No. 51AHa11a, b, c
Description:	Cub Creek about one mile upstream from junction with Bear Creek at a point 2 1/4 miles from Tuxedni Bay. Lot 51AHa 11 bb, collected 50 yards downstream, and lot 51AHa11c, collected 200 yards downstream from lot 51AHa11a. (description from E&R report of Imlay dated Dec. 20, 1951; Shipment AF-51-42)[Transmittal sheet of Hartsock, dated Nov. 30, 1951 provides further details: "11a: Traverse point 69H on Cub Creek about one mile up stream from intersection with Bear Creek. Ammonite collected from very fine-grained sandstone, probably Fitz Creek formation of Mid Jurassic age."; 11b: "Ammonite from approximately same horizon as 51AHa11a. Locality 50 yards downstream from traverse point 69H on Cub Creek. Probably Fitz Creek formation."; 11c: "Two hundred yards downstream from 69H. Ammonite collected from siltstone, probably Fitz Creek formation."][Shown as locality 45 on Pl. 3 of Detterman and Hartsock, 1966 - Note by R.B. Blodgett: digitization of this point gives approx. lat. 60^o 07'14" N., 152^o 45'13" W.][Imlay, 1964, p. B23 provides following description: "J.K. Hartsock, 1951. Tuxedni Bay area. Near Bear Creek about 3 miles S. 62^o W. of mouth of Bear Creek. Gaikema Sandstone. From gray sandy shale in lower 150 ft."]
Location:	Alaska Quadrangle: Kenai A-8 Lat.: 60^o07^'14 ^" Long.: 152^o45^'13 ^"

Reference

Title:	Report on Referred Fossils , 1951 (12/20)
	The only fossil of stratigraphic value in the three lots from the Difficult member of the Tuxedni formation is an ammonite mold in lot 51AHa6. A clay squeeze of this ammonite compares closely with the adult whorls of Erycites from the basal beds of the Kialagvik formation on Wide Bay. You may recall that Don Miller and I found Erycites associated with Tmetoceras and Pseudolioceras at localities 48 AI 77 and 78 at a spot about 2.6 miles N. 77 W. of Fossil Point. This occurrence is about 350 feet above the highest lava beds and slightly lower stratigraphically than your lot 51AHa6. In Europe Tmetoceras characterizes the basal part of the Bajocian stage. The other genera occur in both the lower part of the Bajocian and the upper part of the Toarcian. From these occurrences it is evident that the thick lava sequence on Tuxedni Bay occupies the stratigraphic position of the Lower Jurassic. The Gaikema member is represented certainly by lots 51AHa11a, b, c as shown by the presence of the ammonities Emileia, Lissoceras, and Sonninia. The same species were obtained on the south shore of Tuxedni Bay in unit 33 of the section measured by Stanton and Martin (see U.S.G.S. Bull. 776, p. 142) as shown by specimens in lots 3009 and 21263. The Fitz Creek member is represented by lots 51AHa9 and 10 as shown by the presence of species of Stemmatoceras and Oppelia identical with species obtained on the south shore of Tuxedni Bay in unit 19 of the section measured by Stanton and Martin. Grantz found the same species of Stemmatoceras in his lot 51AGz136, which is a short distance northeast of your localities. The correlations of these members have been discussed in previous memoranda and are shown by charts in your possession.
Report by:	Ralph W. Imlay
Referred by:	John K. Hartsock


Age:	No Data (no specific age given in E&R)
Formation:	Gaikema Sandstone (Gaikema member of the Tuxedni formation)





Comment:	Fossils from the Gaikema member The Gaikema member is represented certainly by lots 51AHa11a, b, c as shown by the presence of the ammonities Emileia, Lissoceras, and Sonninia. The same species were obtained on the south shore of Tuxedni Bay in unit 33 of the section measured by Stanton and Martin (see U.S.G.S. Bull. 776, p. 142) as shown by specimens in lots 3009 and 21263.

Occurrence(s)
No.	Group		Name	Qty	Notes
1	Ammonoids		Emileia sp.
2	Ammonoids		Lissoceras sp.
3	Ammonoids		Sonninia sp.

Title:	Geology of the Iniskin-Tuxedni Region, Alaska , 1966

Report by:	Robert L. Detterman , John K. Hartsock


Age:	Bajocian
Formation:	Gaikema Sandstone





Comment:	Geographic location: Bear Creek Map reference (pl. 3): 45 Stratigraphic position below top of formation (ft): 0-150 all above data from Table 5, p. 28

Occurrence(s)
No.	Group		Name	Qty	Notes
1	Ammonoids		Sonninia (Papilliceras) cf. S. arenata Quenstedt
2	Ammonoids		Lissoceras sp.
3	Ammonoids		Emileia constricta Imlay

Title:	Middle Bajocian ammonites from the Cook Inlet region, Alaska , 1964
	ABSTRACT Jurassic ammonites of middle Bajocian age occur in the Tuxedni Group along the northwest side of Cook Inlet and in the Tuxedni Formation in the eastern part of the Talkeetna Mountain, Alaska. Numerically the dominant families are the Otoitidae and Stephanoceratidae. The families Phylloceratidae, Sonninidae, Oppelidae, and Perisphinctidae together compose only about one-third of the total specimens. The Tuxedni Group has not furnished any ammonite genera that characterize the European zone of Sonninia sowerbyi at the base of the middle Bajocian. It has, however, furnished ammonites that characterize the next higher zones of Otoites sauzei and Stephanoceras humphriesianum. ......
Report by:	Ralph W. Imlay


Age:	Bajocian (middle Bajocian)
Formation:	Gaikema Sandstone





Comment:	Shown as locality 21 in Figure 2. Collector's field no. listed as 51AHa11. At one place (Mesozoic loc. 22723) the lower 150 feet of the formation has furnished the ammonites Sonninia (Papilliceras), Emileia, and Lissoceras (table 5). (from Imlay, 1964, p. B8)

Occurrence(s)
No.	Group		Name	Qty	Notes
1	Ammonoids		Sonninia (Papilliceras) cf. S.(P.) arenata Quenstedt		One specimen from this locality illustrated in Pl. 6, fig. 1
2	Ammonoids		Lissoceras sp.
3	Ammonoids		Emileia constricta Imlay, n. sp.