Report on Referred Fossils |
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| Stratigraphic range: |
Lower Jurassic |
| Kinds of fossils: |
Mollusks |
| Quadrangle or area: |
Talkeetna Mountains (A-3) |
| Shipment No.: |
A-62-16 |
| Referred by: |
Grantz, Arthur
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| Report prepared by: |
Imlay, Ralph W.
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| Date: |
09/19/1962 |
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Fossils from the Talkeetna Formation in collections 62AGz80 and 80A do not contain fossils of age significance. Collections 62AGz84, 84A and 84B contain the ammonite Crucilobiceras which in Europe ranges from the upper Sinemurian into the basal Pliensbachian. It is associated in collection 84 and probably in 84A with Acanthopleuroceras which is characteristic of the lower Pliensbachian. Collection 62AGz83 contains the ammonite Radstockiceras which occurs in the lower Pliensbachian of Europe. Please let me know if this data helps in dating the emplacement of the Talkeetna batholith. Also, when you find time, please send me a copy of the Talkeetna Mts. (A-3) quadrangle showing the locations of these fossil collections.
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Brief statement of problem and remarks (from collector):
These collections are from the Talkeetna Formation, which is cut by a batholith in the eastern Talkeetna Mountains. It is hoped that these collections will give a maximum age for the emplacement of the batholith. Quadrange: Talkeetna Mountains (A-3). Collector(s) & year: Arthur Grantz and R.F. Gebhardt, 1962. Field notebook reference: Grantz, 1962, p. 33-35.
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| User Note module to be added |
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62AGz80
(Mesozoic loc. 28658)
, Talkeetna Mts
, Hornfelsed sandstone and siltstone with shelly beds. Lat. 62 deg. 13'02" N., Long. 148 deg. 03'40" W. (Coords. 14.15-15.1).
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62AGz80A
(Mesozoic loc. 28659)
, Talkeetna Mts
, Fargmental limestone, partly recrystallized, tuffaceous. Lat. 62 deg. 12'56" N., Long. 148 deg. 03'23" W. (Coords. 14.3-15.0).
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62AGz84
(Mesozoic loc. 28661)
, Talkeetna Mts
, Calcareous siltstone. Lat. 62 deg. 13'29" N., Long. 148 deg. 01'27" W., (Coords. 15.35-15.63) [Arthur Grantz, 1962, on Nowhere Creek. Lat. 62 deg. 13'29" N., long. 148 deg. 01'27" W., Coordinates 15.35-15.63. Talkeetna Mountains (A-3) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Sinemurian. (description from Imlay, 1981, p. 26)]; Mesozoic loc. 28661 in Talkeetna Mountains A-3 quadrangle, coordinates 15.35, 15.63, lat 62°13'29" N., long 148°01'27" W. Talkeetna Mountains, Cook Inlet region. Crucilobiceras. (description from Imlay and Detterman, 1973, p. 22); [USGS Mes. Cat.: Lower Jurassic - Talkeetna Formation. Orig. No. 62AGz84. Calc. siltstone. Lat. 62°13'29" N., Long. 148°01'27" W. , (Coords. 15.35-15.63). Nowhere Ck., Talkeetna Mts. A-3 Quad., Alaska. Collector: Grantz and Gebhardt, 1962.]
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Crucilobiceras cf. C. densinodulum Buckman
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Crucilobiceras cf. C. silviesi Hertlein
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62AGz84A
(Mesozoic loc. 28662)
, Talkeetna Mts
, Tuffaceous siltstone. Lat. 62 deg. 13'30" N., Long. 148 deg. 01'18" W. (Coords. 15.43 - 15.65) [Arthur Grantz, 1962. On Nowhere Creek, lat 62 deg. 13'30" N., long 148 deg. 01'18" W., Coordinates 15.43-15.65, Talkeenta Mountains (A-3) quadrangle, Talkeetna Mountains, southern Alaska. Late Sinemurian. (description from Imlay, 1981, p. 26)]
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62AGz84B
(Mesozoic loc. 28663)
, Talkeetna Mts
, Talus and stream float. Lat. 62 deg. 13'30" N., Long. 148 deg. 01'12" W. (Coords. 15.5 - 15.65) [Arthur Grantz, 1962. Talus and stream float, lat 62 deg 13'30" N., long 148 deg 0'12" W., Coordinates 11.5-15.65, Talkeetna Mountains (A-3) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Sinemurian. (description from Imlay, 1981, p. 26)]
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Crucilobiceras cf. C. silviesi Hertlein
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Weyla cf. W. alata (von Buch)
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