Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Lower Jurassic
Kinds of fossils: Ammonites
Quadrangle or area: Talkeetna Mountains, Anchorage quads.
Shipment No.: A-76-39
Referred by: Grantz, Arthur
Report prepared by: Imlay, Ralph W.
Date: 12/17/1976

Enclosed is a list of Lower Jurassic ammonite genera and species present in the Talkeetna Mountains. Please note that all ammonite localities of age significance are listed and that the ammonites are grouped under the stages Sinemurian, Pliensbachia and Toarcian. In Europe Paltechioceras occurs only in the highest Sinemurian. Crucilobiceras occurs mostly in the highest Sinemurian but a few species occur in the basal Pliensbachian. Their association at several localities in the Talkeetna Mountains is evidence that the beds in which they occur represent the upper Sinemurian. The ranges of most of the other ammonite genera listed under Pliensbachian and Toarcian are shown on p. C16 (fig. 6) in U.S.G.S. Prof. Paper 593-C (see discussion on p. C17-C21). Genera not listed therein include Uptonia and Apoderoceras from the basal Pliensbachian, Amaltheus from the upper Pliensbachian, Phymatoceras and Brodieia from the upper Toarcian, and Pseudolioceras from lower Toarcian to lower middle Bajocian. On the basis of these ranges the Talkeetna Formation has furnished ammonites of late Sinemurian to late Toarcian age.

As explained in your letter of May 2, 1961, these fossil collections cannot reliably be assigned to stratigraphic positions within the Talkeetna Formation. If that conclusion still holds true, please try to make gross assignments to the three units as discussed in that letter. It would be of some value if the middle and upper units can be dated.

Your comments will be appreciated.

Lower Jurassic Ammonites in the Talkeetna Mountains

Toarcian

Dactylioceras cf. D. commune (J. Sowerby) - 24787 and 29198
D. (Orthodactylites) kanense McLearn - 29198
Harpoceras cf. H. exaratum (Young & Bird) - 29198
Pseudolioceras sp. - 25317
Grammoceras? sp. - 25939
Phymatoceras? sp. - 25317, 25342
Brodieia cf. B. tenuicostata (Jaworski) - 25940
Haugia cf. H. variabilis (d'Orbigny) - 25318, 27508
H. cf. H. grandis Buckman - 24111, 24114
H. cf. H. compressa Buckman - 24114
H. sp. - 25316, 25319, 25359

Pliensbachian

Leptaleoceras pseudoradians (Reynes) - 29450
Uptonia sp. juv. - 6697
Amaltheus cf. A. stokesi (J. Sowerby) - 25941
A. sp. - M2441
A. sp. - M2441
Fontanelliceras cf. F. fontanellense (Gemmellaro) - 25941, 27586, 29450
Arieticeras cf. A. domarense (Meneghini) - 24107, 27586, 29450
Protogrammoceras cf. P. platum Buckman - 24108, 25941, 29449
P. cf. P. argutum (Buckman) - 24108, 25941
P. sp. - 29450
Fanninoceras kunae McLearn - 24107, 24108, 27586
F. cf. F. carlottense McLearn - 24108, 29449
Apoderoceras cf. A. subtriangulare (Young & Bird) - 6697, M6171

Sinemurian

Paltechioceras cf. P. harbledownensis (Crickmay) - 28661, 28663
Crucilobiceras cf. C. densinodulum Buckman - 28661
C. cf. C. muticum (d'Orbigny) - 28661, 28662, 28663
C. cf. C. submuticum (Oppel) - 6706, 28661
C. sp. juv. - 26772

User Note module to be added
53AGz40 (Mesozoic loc. 24787) , Anchorage , A. Grantz and L. Fay, 1953. Anchorage D-2 quad., Lat. 61 deg. 50' 53" N., Long. 147 deg. 24' 43" W., about 0.6 miles southwest of point where Camp Creek crosses the Glenn Highway and about 0.56 miles northwest of B.M. 3351. Talkeetna formation, upper part. [Arthur Grantz and L.F. Fay, 1953. About 0.6 mile (1 km) northwest of point where Camp Creek crosses Glenn Highway, lat 61 deg. 50'53" N, long. 147 deg. 24'43" W., Anchorage (D-2) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation. Early Toarcian (from Imlay, 1981, p. 26)]
Dactylioceras cf. D. commune (Sowerby)
SUS62 (Mesozoic loc. 29198) , Anchorage , British Petroleum Expl. (Alaska) Co. From saddle on south side of Kings Mountain 2 1/2 miles (4 km) S. 15 deg. E. of VABM 757 on the Glenn Highway. Anchorage (C-5) quadrangle. Chugach Mountains, southern Alaska. Talkeetna Formation. Early Toarcian.
Dactylioceras cf. D. commune (Sowerby)
Dactylioceras (Orthodactylites) kanense McLearn
Harpoceras cf. H. exaratum (Young and Bird)
54AGz49A (Mesozoic loc. 25317) , Talkeetna Mts , Art Grantz and L.F. Fay, 1954, Talkeetna Mtns. A-2 quad., Lat. 62 deg. 00'06"N., Long. 147 deg. 31'30"W., Talkeetna formation, upper part. [Arthur Grantz and L.F. Fay, 1954. Lat 62 deg 00'06" N., long 147 deg. 31'30" W., Talkeetna Mountains (A-1) quadrangle, Talkeetna Mountains, southern Alaska. Upper part of Talkeetna Formation. Late Toarcian. (from Imlay, 1981, p. 26)]
Phymatoceras? sp.
Pseudolioceras sp.
55AGz182 (Mesozoic loc. 25939) , Valdez , Arthur Grantz, 1955. Valdez D-8 quad., 61 deg. 54'02" N., 146 deg. 52'00" W. [Note by RBB: locality description from Grantz's 1955 transmittal sheet gives a differing Lat. of 61 deg. 54'34" N., versus that above which is from an Imlay E&R dated 5/23/61]--[Arthur Grantz, 1955. Lat. 61 deg. 54'02"N., long. 146 deg. 52'00"W., Valdez (D-8) quadrangle, south side of western Copper River basin, southern Alaska. Talkeetna Formation. Late Toarcian. (description from Imlay, 1981, p. 25)]
Grammoceras? sp.
54AFy24 (Mesozoic loc. 25342) , Talkeetna Mts , L.F. Fay, 1954. Talkeetna Mtns. A-1 quad., Lat. 62 deg. 02'48"N., Long. 147 deg. 29'34"W. Talkeetna formation. [L.F. Fay, 1954. Lat 62 deg. 02'48" N., long 147 deg. 29'34" W., Talkeetna (A-1) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Torcian. (from Imlay, 1981, p. 26)]
Phymatoceras? sp.
55AGz228a (Mesozoic loc. 25940) , Talkeetna Mts , Arthur Grantz, 1955. Talkeetna Mts. A-1 quad., Lat. 62 deg. 01'37" N., 147 deg. 17'53" W. Upper part of Talkeetna Formation. [Note by RBB: Grantz's transmittal sheet gives differing Lat. and Long. of: Lat. 62 deg. 01'21" N., 147 deg. 17'49" W., slightly differing from that given above which was taken from Imlay E&R of 5/23/61]--[Arthur Grantz, 1955. Lat 62 deg. 01'37" N., long 147 deg. 17'53" W., Talkeetna Mountains (A-1) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Toarcian. (description from Imlay, 1981, p. 26)]
Brodieia cf. B. tenuicostata (Jaworksi)
54AGz50 (Mesozoic loc. 25318) , Talkeetna Mts , Arthur Grantz and L.F. Fay, 1954. Talkeetna Mtns. A-2 quad., Lat. 62 deg. 00'10"N., Long. 147 deg. 32'33"W., Talkeetna formation. [Arthur Grantz and L.F. Fay, 1954. Lat 62 deg. 00'10" N., long. 147 deg. 32'33" W., Talkeetna Mountains (A-2) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Toarcian. (from Imlay, 1981, p. 26)]
Haugia cf. H. variabilis (d'Orbigny)
6-10BMB General Petrol. Corp. 1959 (Mesozoic loc. 27508) , Talkeetna Mts , General Petroleum Corp., 1959. Talkeetna Mountains A-2 quad., Coordinates 20.54 - 0.52. Near head of McDougall Creek. Brown sandstone and shale. Talkeetna? formation. [General Petroleum Corp., 1959. Near head of McDougall Creek. Coordinates 15.9-0.37. Talkeetna Mountains (A-2) quadrangle. Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Toarcian. (description from Imlay, 1981, p. 26)]
Haugia cf. H. variabilis (d'Orbigny)
52AGz253 (Mesozoic loc. 24111) , Anchorage , Grantz, Hoare and Imlay, 1952. Anchorage D-2 quad., 5.04 miles N 33 degrees E of mouth of Sheep Creek. Talkeetna formation. [Arthur Grantz, R.D. Hoare, and R.W. Imlay, 1952. 5.04 miles (8 kms) N. 33 deg. E. of the mouth of Sheep Creek. Anchorage (D-2) quadrangle, Talkeetna Mountains, southern Alaska. Early Toarcian. (description from Imlay, 1981, p. 26)]
Haugia cf. H. grandis Buckman
52AGz98 (Mesozoic loc. 24114) , Talkeetna Mts , Grantz, Hoare and Imlay, 1952. Talkeetna Mountains A-1 quad., north branch of North Creek, 1.61 miles N 45 degrees W of mouth of North Creek. Talkeetna formation, hard siltstone probably transitional into Tuxedni formation. [Arthur Grantz, R.D. Hoare, and R.W. Imlay, 1952. From north branch of North Creek, 1.61 miles (2.5 km) N. 45 deg. W. of its mouth. Talkeetna Mountains (A-1) quadrangle, southern Alaska. Talkeetna Formation. Late Toarcian (description from Imlay, 1981, p. 26)]
Haugia cf. H. grandis Buckman
Haugia cf. H. compressa Buckman
54AGz48A (Mesozoic loc. 25316) , Talkeetna Mts , Art Grantz and L.F. Fay, 1954. Talkeetna Mtns. A-1 quad., Lat. 62 deg. 00' 42" N., Long. 147 deg. 27' 49" W., Talkeetna formation. [Arthur Grantz and L.F. Fay, 1954. Lat 62 deg. 00'42" N., long 147 deg. 27'49" W., Talkeetna Mountains (A-1) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation, upper part. Late Toarcian. (from Imlay, 1981, p. 26)]
Haugia sp.
54AGz51 (Mesozoic loc. 25319) , Talkeetna Mts , Art Grantz and L.F. Fay, 1954. Talkeetna Mtns. A-2 quad., Lat. 62 deg. 00'00 1/2"N., Long. 147 deg. 32'45"W. [Arthur Grantz and L.F. Fay, 1954. Lat 62 deg. 00'00 1/2" N., long 147 deg. 32'45" W., Talkeetna Mountains (A-2) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Toarcian. (from Imlay, 1981, p. 26)]
Haugia sp.
54AFy130 (Mesozoic loc. 25359) , Talkeetna Mts , L.F. Fay, 1954. Talkeetna Mtns. A-1 quad., Lat. 62 deg. 02'40"N., Long. 147 deg. 21'36"W. [L.F. Fay, 1954. Lat 62 deg. 02'40" N., long 147 deg. 21'36" W., Talkeetna Mountains (A-1) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Toarcian. (from Imlay, 1981, p. 26)]
Haugia sp.
66AGz31B (Mesozoic loc. 29450) , Anchorage , On south tributary of Squaw Creek 1.95 mi. N. 28 1/2 degrees E. of southeast summit of Gunsight Mtn. [Data from transmittal sheet - RBB] -- [Arthur Grantz, 1966. On south tributary of Squaw Creek, 1.95 miles (3.1 km) southeast of summit of Gunsight Mountain, near USGS Mesozoic loc. 24107. Anchorage (D-2) quadrangle. Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Pliensbachian. (description from Imlay, 1981, p. 26)]
Leptaleoceras pseudoradians (Reynes)
Fontanelliceras cf. F. fontanellense (Gemmellaro)
Arieticeras cf. A. domarense (Meneghini)
Protogrammoceras sp.
"USGS Mesozoic loc. 6697" (Mesozoic loc. 6697) , Anchorage , Doone Creek, at mouth of gulch, 3,950-foot point on traverse of August 30. Float. G.C. Martin, 1910 (description from Martin, 1926, p. 222) [Aug. 30, 1910. G.C. Martin, 1910. Doone Creek at mouth of gulch. Anchorage (D-4) quadrangle, Talkeetna Mountains, southern Alaska. Float from Talkeetna Formation. Early Pliensbachian. (description from Imlay, 1981, p. 26 - note by R.B. Blodgett, listing of USGS loc. as 6797 on p. 26 is a mistake, should be 6697 as on p. 21 (Table 5)]
Uptonia? sp. juv.
Apoderoceras cf. A. subtriangulare (Young)
55AGz294 (Mesozoic loc. 25941) , Anchorage , Arthur Grantz, 1955. Anchorage D-1 quad., Lat. 61 deg. 51'51" N., Long. 147 deg. 21'22" W., at east end of Sheep Mountain. Talkeetna formation, upper part. [Grantz's 1955 transmittal form contain the penciled-in coordinates of 0.62-7.87]--[Arthur Grantz, 1955. Lat. 61 deg. 51'51" N., long 147 deg. 21'22" W., at east end of Sheep Mountain. Anchorage (D-1) quadrangle, Talkeetna Mountains, southern Alaska. Talkeetna Formation, upper part. Late Pliensbachian. (description from Imlay, 1981, p. 26)]
Amaltheus cf. A. stokesi (J. Sowerby)
Fontanelliceras cf. F. fontanellense (Gemmellaro)
Protogrammoceras cf. P. paltum (Buckman)
Protogrammoceras cf. P. argutum (Buckman)
64ATr204F (Mesozoic loc. M2441) , De Long Mts , Lisburne Peninsula, Alaska, DeLong Mtns., 1:250,000 quad. Lat. 68 deg. 37' N., long. 164 deg. 11' W. On Ipewik River. Coll: O.L. Tailleur, T. P. Miller, 1964. (description from D.L. Jones E&R report, 11/16/64) [I.L. Tailleur, 1964. On Ipewik River on north side of DeLong Mountains near USGS Mesozoic loc. 29164, lat. 68 deg. 37' N., long 164 deg. 11' W., northern Alaska. Unnamed beds. Late Pliensbachian. (from Imlay, 1981, p. 24)]; [USGS Mesozoic loc. M2441. Ipewik River, De Long Mountains, lat 68°37' N., long 164°11' W. ... . Amaltheus sp. (description from Imlay and Detterman, 1973, p. 22)]
Amaltheus sp.
13177-2 (Mesozoic loc. 27586) , Anchorage , Standard Oil of California. Carbon Creek, 2.3 miles (3.7 km) S. 7 deg. E. of its mouth near center of SW1/4 sec. 12, T. 19 N., R. 5 E., Anchorage (C-4) quadrangle, coordinate 1.4-17.3, Chugach Mountain, southern Alaska, Talkeetna Formation. Late Pliensbachian. (from Imlay, 1981, p. 26)
Fontanelliceras cf. F. fontanellense (Gemmellaro)
Arieticeras cf. A. domarense (Meneghini)
Fanninoceras kunae McLearn
52AGz63 (Mesozoic loc. 24107) , Anchorage , Hoare, Imlay and Grantz, 1952. Anchorage D-2, on south tributary of Squaw Creek, 1.98 miles N 28 1/2 degrees E of southeast summit of Gunsight Mountain. Talkeetna formation. [R.D. Hoare, R.W. Imlay, and Arthur Grantz, 1952. On south tributary of Squaw Creek, 1.98 miles (3.2 km) N. 28 1/2 deg. E of southeast summit of Gunsight Mountain. Anchorage (D-2) quad. Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Pliensbachian. (description from Imlay, 1981, p. 26)]
Arieticeras cf. A. domarense (Meneghini)
Fanninoceras kunae McLearn
52AGz66 (Mesozoic loc. 24108) , Anchorage , Grantz, Hoare and Imlay, 1952. Anchorage D-2 quad., on south tributary of Squaw Creek, 1.91 miles N 28 1/2 degrees E. of southeast summit of Gunsight Mountain. Talkeetna formation. [Arthur Grantz, R.D. Hoare, and R.W. Imlay, 1952. Differs from USGS Mesozoic loc. 24107 by being 1.91 miles (3.1 km) N. 28 1/2 deg. E. of southeast summit of Gunsight Mountain. Late Pliensbachian (description from Imlay, 1981, p. 26)]
Protogrammoceras cf. P. paltum (Buckman)
Protogrammoceras cf. P. paltum (Buckman)
Fanninoceras kunae McLearn
Fanninoceras cf. F. carlottense McLearn
66AGz31A (Mesozoic loc. 29449) , Anchorage , On the south tributary of Squaw Creek 1.91 mi. N. 28 1/2 degrees E. of southeast summit of Gunsight Mtn. [Same place and stratigraphic position as USGS Mesozoic loc. 24108. (description from Imlay, 1981, p. 26)]
Protogrammoceras cf. P. argutum (Buckman)
Fanninoceras cf. F. carlottense McLearn
73APr85A (Mesozoic loc. M6171) , Anchorage , Float. South flowing branch of Doone Creek, 2400 feet north and 2000 feet west of S.E. cor. sec. 25, T. 21 N., R. 5 E., Anchorage D-4 quad., Talkeetna Mtns., Alaska. [George Plafker, 1973. On south-flowing branch of Doone Creek, 2,000 ft (610 m) west of SE. cor. sec. 25, T. 21 N., R. 5 E., Anchorage (D-4) quadrangle. Talkeetna Mountains, southern Alaska. Talkeetna Formation. Early Pliensbachian. (description from Imlay, 1981, p. 26)]
Apoderoceras cf. A. subtriangulare (Young)
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.]
Paltechioceras cf. P. harbledownense (Crickmay)
Crucilobiceras cf. C. densinodulum Buckman
Crucilobiceras cf. C. muticum (d'Orbigny)
Crucilobiceras cf. C. submuticum (Oppel)
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)]
Crucilobiceras cf. C. muticum (d'Orbigny)
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)]
Paltechioceras cf. P. harbledownense (Crickmay)
Crucilobiceras cf. C. muticum (d'Orbigny)
"USGS Mesozoic loc. 6706" (Mesozoic loc. 6706) , Anchorage , A.H. Brooks, 1910. Creek entering Chickaloon River from west one mile above Government Bridge at elevation of 2000 feet. Talkeetna formation. [Grantz letter of May 2, 1961 states locality is in Anchorage D-4 quad. with the coordinates of 3.0 -9.0]; Creek entering Chickaloon River from west 1 mile above Government Bridge, altitude 2,000 feet. G.C. Martin, 1910. (description from Martin, 1926, p. 223)
Crucilobiceras cf. C. submuticum (Oppel)
57AGz30 (Mesozoic loc. 26772) , Talkeetna Mts , Arthur Grantz, 1957. Talkeetna Mountains A-2 quad., Lat. 62 deg. 59'58" N., Long. 147 deg. 57'48"W., Coordinates 1.20-17.23. Talkeetna formation. Possibly on a landslide or rubble mass. [Arthur Grantz, 1957. Lat. 62 deg. 59'58" N., long 147 deg. 57'48" W., Coordinates 1.20-17.23. Talkeetna Moutains (A-2) quadrangle. Talkeetna Mountains, southern Alaska. Talkeetna Formation. Late Sinemurian. (description from Imlay, 1981, p. 26)]; [USGS Mesozoic loc. 26722. Talkeetna Mountains A- 2 quadrangle, coordinates 1.20, 17.23, lat 62°59'58" N., long 147°57'48" W. ... Crucilobiceras. (description from Imlay and Detterman, 1973, p. 22)]; [USGS Mes. Cat.: Lower Jurassic-Talkeetna fm. 57-AGz-30. Talkeetna (A-2). Coords. 1.20-17.23. Lat. 62°59'58" N. Long. 147°57'48" W. Possibly landslide. Coll. Grantz, 1957]
Crucilobiceras sp. juv.