Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Basal Jurassic
Kinds of fossils: Ammonites
Quadrangle or area: Coleen Quad., Alaska
Shipment No.: A-75-1
Referred by: Tailleur, Irv L.
Report prepared by: Imlay, Ralph W.
Date: 02/14/1977

The fossils from the Old Rampart area examined previously in 1975 (see report A-75-1) have been restudied for inclusion in a Professional Paper and are listed as follows:
Franziceras cf. rudidium (Buckman) at U.S. Geol. Survey Mesozoic locs. 29737, 29739, 29742. [Note by R.B. Blodgett: species name misspelled in E&R report, should be ruidum]
F. sp. at Mesozoic loc. 29742
F.? sp. at Mesozoic locs. 29740 and 29737.
Psiloceras sp. at Mesozoic loc. 29737.
Amaltheus stokesi (J. Sowerby) at Mesozoic loc. 29340.
Franziceras and Psiloceras occur nearly worldwide in the basal Hettangian at the base of the Jurassic. Amaltheus occurs in the upper Pliensbachian of northwestern Europe and as far south as British Columbia in North America.
The localities listed above are described below. Unless you inform me otherwise the fossil identifications, age determinations and locality descriptions are written herein will be used in a publication.

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63ABe47B (Mesozoic loc. 29737) , Coleen , W.P. Brosge, 1963, Spike Mountain, about 30 miles north of Old Rampart, Porcupine River area, Coleen quad., east-central Alaska. Glenn Shale (in part), thin unit of hematitic conglomeratic sandstone interbedded with black, fine-grained quartzite sandstone. (description from Imlay E&R report, 2/14/77) [W.P. Brosge, 1963. Spike Mountain, about 3 miles (48 km) north of Old Rampart, lat. 63 deg. 35.75' N., long 141 deg. 40' W. [Note by R.B. Blodgett: lat. incorrect as given, should be 67 deg.], Porcupine River area, Coleen quadrangle, east-central Alaska. Glenn Shale (in part). A thin unit of red conglomeratic sandstone interbedded with black, fine-grained quartzitic sandstone. Early Hettangian. (from Imlay, 1981, p. 24)]; [USGS Mesozoic locs. 29737 and 29738. From Spike Mountain near the Porcupine River about 30 miles north of Old Rampart, Coleen quadrangle, lat 63°35.75' N., long 141°40' W. Psiloceras. (description from Imlay and Detterman, 1973, p. 21)]; [[USGS Mes. Cat.: Lower Jurassic. Orig. No. 63ABe47B. From thin unit of hematitic congl. ss. interbedded in black, very fine-grained quartzitic ss. on Spike Mtn., Coleen Quadrangle, Lat. 63°35.75' N., Long 141°40' W., Porcupine River Area, eastern Alaska. Collector: Brosge, 1963]
Franziceras cf. F. ruidum (Buckman)
Franziceras? sp.
Psiloceras sp.
67ARr-337a (Mesozoic loc. 29738) , Coleen , W.P. Brosge, 1963, Spike Mountain, about 30 miles north of Old Rampart, Porcupine River area, Coleen quad., east-central Alaska. Same location as Mesozoic 29737. Collection made from apparent top of 120 ft. of beds overlying granite. (description from Imlay E&R report, 2/14/77) [W.P. Brosge, 1967. Same location as USGS Mesozoic loc. 29737. Fossil from apparent top of 120 ft (36.6 m) of beds overlying granite. Early Hettangian. (from Imlay, 1981, p. 24)]; [USGS Mesozoic locs. 29737 and 29738. From Spike Mountain near the Porcupine River about 30 miles north of Old Rampart, Coleen quadrangle, lat 63°35.75' N., long 141°40' W. Psiloceras. (description from Imlay and Detterman, 1973, p. 21)]; [[USGS Mes. Cat.: Lower Jurassic. Orig. No. 67ARR 337a. Same place as loc. 29737 (63ABe47B) on Spike Mtn. but collected stratigraphically from 120 ft. of beds. Near granite contact. Coll. 67ARR337a from apparent top of sequence. Collectors: W.P. Brosge and Reiser, 1967]
Franziceras cf. F. ruidum (Buckman)
67ARr-337d (Mesozoic loc. 29739) , Coleen , W.P. Brosge, 1963. Same data as loc. 29738 but from 20 ft. below apparent top. (description from Imlay E&R report, 2/14/77) [Same data as Mesozoic loc. 29738 but from 20 ft (6 m) below apparent top. Early Hettangian. (from Imlay, 1981, p. 24)]
Franziceras cf. F. ruidum (Buckman)
67ARr-337 l-n (Mesozoic loc. 29740) , Coleen , W.P. Brosge, 1963. Same data as loc. 29738 but from 40 ft. below apparent top. (description from Imlay E&R report, 2/14/77) [Same data as Mesozoic loc. 29738 but from 40 ft (12 m) below apparent top. Early Hettangian. (from Imlay, 1981, p. 24)]
Franziceras? sp.
67ARr-337 e-h (Mesozoic loc. 29742) , Coleen , W.P. Brosge, 1963. Same data as loc. 29738 but from 80 ft. below apparent top. (description from Imlay E&R report, 2/14/77) [Same data as Mesozoic loc. 29738 but from 80 ft (24 m) below apparent top. Early Hettangian. (from Imlay, 1981, p. 24)]
Franziceras cf. F. ruidum (Buckman)
Franziceras sp.
67ARr-337 q-s (Mesozoic loc. 29743) , Coleen , W.P. Brosge, 1963. Same data as loc. 29738 but from 100 ft. below apparent top. (description from Imlay E&R report, 2/14/77) [Same data Mesozoic loc. 29738 but from 100 ft (30.5 m) below apparent top. Early Hettangian. (from Imlay, 1981, p. 24)]
KPO688 (Mesozoic loc. 29340) , Coleen , British Petroleum (Alaska) Inc. Float from river bluff in the Middle Salmon Trout River about 9 miles east-southeast of Old Rampart in Porcupine River area, Coleen Quad., east central Alaska. Glenn Shale (in part). From non-calcareous, pyritic, thin-bedded mudstone interbedded with dark gray, papery shale exposed on bluff. (description from Imlay E&R report, 2/14/77) [British Petroleum (Alaska) Inc. Float from river bluff in the middle fork Salmon Fork River about 9 miles (14.4 km) east southeast of Old Rampart in Porcupine River area. Coleen quadrangle, east-central Alaska. Glenn Shale (in part). Noncalcareous, pyritic, thin-bedded mudstone interbedded with dark-gray papery shale exposed on bluff. Late Pliensbachian. (from Imlay, 1981, p. 24)]; [ USGS Mesozoic loc. 29340. Float from bluff on the Middle Salmontrout River near Old Rampart, Kandik area, east central Alaska. Amaltheus. (description from Imlay and Detterman, 1973, p. 22)]; [USGS Mes. Cat.: Lower Jurassic. Orig. No. KPO 688. From scree debris derived from river bluff in the middle Salmon Trout River which flows into Porcupine River at Old Rampart, Kandik area, east-central Alaska. Bluff consists of non-calcareous, slightly pyritic mudstone b eds from 3" to 6" thick interbedded with dark gray papery shales. Collector: British Petrol. Expl. Co., 1962]
Amaltheus stokesi (J. Sowerby)