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Authors: Jones, David L. , Gryc, George
Editors:
Date: /1960
Title: Upper Cretaceous Pelecypods of the Genus Inoceramus from Northern Alaska.
334-E , , 149-165 , Pls. 15-23, 3 Figs., 2 Tables
Host: U.S. Geological Survey Professional Paper:
Document Type: Article\Abst.\Chapter\report
Annotation: Abstract--Upper Cretaceous rocks in the Colville River region of northern Alaska contain a fauna consisting of five species of Inoceramus, all of which are known from other localities, either in the United States, Canada, Europe, or elsewhere. Associated fossils include a small number of pelecypod species, a few species of gastropods, and several species of ammonites. The species of Inoceramus range in age from Cenomanian to the Santonian or early Campanian, but none are of Coniacian age.

Upper Cretaceous rocks in the Colville River region are divided into three formations, which are, in ascending order, the Ninuluk, the Seabee, and the Schrader Bluff. Inoceramus (Inoceramus) dunveganensis McLearn, of Cenomanian age, is abundant in the Ninuluk formation. Inoceramus (Mytiloides) labiatus (Schlotheim) and I. aff. I. (Inoceramus) cuvierii Sowerby occur in the lower part of the Seabee formation of early Turonian age. Inoceramus. aff. I. (Inoceramus) cuvierii occurs alone in the upper part of the Seabee, which probably is of middle to late Turonian age. There is no evidence that this species extends into the Coniacian in northern Alaska. The Barrow Trail member of the Schrader Bluff formation contains Inoceramus (Sphenoceramus) patootensis de Loriol and I. (S). steenstrupi de Loriol, both of late Santonian to early Campanian age. The precise age of the lower and upper members of the Schrader Bluff formation is not certain.

UserNote
45AWa97 (Mesozoic loc. 20465) , Ikpikpuk River , Ninuluk Formation, basal part of formation. Colville River, south bank, lat. 69 deg. 04'30" N., long. 153 deg. 41' W. Sandstone and conglomerate. Collector, W.A. Warner, 1945. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
45AWa82 (Mesozoic loc. 20466) , Killik River , Ninuluk formation, 10 ft above base. Killik River, northeast bank about 10 miles upstream from Colville River, lat 68 deg. 59' N., long 153 deg. 36'30" W. Collector, W.A. Warner. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
45AWa122 (Mesozoic loc. 20467) , Ikpikpuk River , Ninuluk formation, basal part of formation. Colville River, south bank, lat 69 deg. 08' N., long 153 deg. 18' W. Same locality as 25148. Sandstone float. Collector, W.A. Warner, 1945. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
45AWa123A (Mesozoic loc. 20468) , Ikpikpuk River , Ninuluk formation, 10 ft above base. Colville River, south bank, same locality as 20467. Collector, W.A. Warner, 1945. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
45AKr155 (Mesozoic loc. 20475) , Ikpikpuk River , Ninuluk formation, 420 ft above base. Colville River, south bank, lat 69 deg. 08' N., 153 deg. 18' W. Collector, C.E. Kirschner, 1945. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
45AKr162 (Mesozoic loc. 20476) , Ikpikpuk River , Ninuluk formation, basal 100 ft of formation. Colville River, south bank; lat 69 deg. 09' N., long 153 deg. 15' W. Sandstone. Collector, C.E. Kirschner, 1945. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
46ARy100B (Mesozoic loc. 20418) , Ikpikpuk River , Ninuluk formation, 600-650 ft below top. Weasel Creek, 2.5 miles southwest of confluence with Maybe Creek, lat 69 deg. 13' N., long. 153 deg. 58' W. Cut bank on east side of stream, poorly exposed massive to slabby sandstone, 50-60 ft thick. Collector, R.G. Ray, 1946. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
46ARy125E (Mesozoic loc. 20419) , Ikpikpuk River , Ninuluk formation, stratigraphic position probably same as 20418. On an unnamed stream 1.6 miles southeast of its confluence with Maybe Creek, lat 69 deg. 15'30" N., long 153 deg. 33' W. Cut bank on northeast side of stream imperfectly exposing about 100 ft of sandstone with subordinate shale and coal. Fossils occur talus. Collector, R.G. Ray, 1946. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
47ADt107 (Mesozoic loc. 25148) , Ikpikpuk River , Ninuluk formation, 100 ft above base. Colville River, south bank, lat 69 deg. 08' N., long 153 deg. 18' W. Thin-bedded sandstone. Collector, R.L. Detterman, 1947. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
47ADt158 (Mesozoic loc. 25154) , Ikpikpuk River , Ninuluk formation, near base of formation. On ridge south of tributary of Ninuluk Creek, lat 69 deg. 11' N., long 153 deg. 02' W. Sandstone and conglomerate. Collector, R.L. Detterman, 1947. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
47ADt163 (Mesozoic loc. 25155) , Ikpikpuk River , Ninuluk formation, basal part of formation. Colville River, north bank, lat 69 deg. 13'30" N., long 153 deg. 03' W. Interbedded sandstone, siltstone and clay shale. Collector, R.L. Detterman, 1947. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
48ADt215 (Mesozoic loc. 25140) , Chandler Lake , Ninuluk formation, basal 100 ft of formation. Chandler River, east bank, lat 68 deg. 49'15" N., long 151 deg. 57'30" W. Sandstone and conglomerate. Collector, R.L. Detterman, 1948. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
52ABl45 (Mesozoic loc. 24264) , Chandler Lake , Ninuluk formation, basal part of formation. On ridge west of Ayiyak River, lat 68 deg. 57'30" N., long 152 deg. 28' W. Green to yellow-red sandstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
52ABl181 (Mesozoic loc. 24268) , Chandler Lake , Ninuluk formation, near base of formation. Anaktuvuk River, lat 68 deg. 55' N., long. 151 deg. 11'30" W. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
52ADt132 (Mesozoic loc. 24276) , Chandler Lake , Ninuluk formation, base of formation. Wolverine Creek, east bank of east fork, lat. 68 deg. 45' N., long 152 deg. 22' W. Massive conglomerate and sandstone. Collector, R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
52ADt74 (Mesozoic loc. 24278) , Chandler Lake , Ninuluk formation, middle of formation. On ridge top, lat 68 deg. 59'30" N., long 152 deg. 51' W. Medium-bedded, salt-and-pepper sandstone. Collector, R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
52ADt102 (Mesozoic loc. 24283) , Chandler Lake , Ninuluk formation, 100-150 ft above base. On ridge south of Ayiyak River, lat 68 deg. 55' N., long 152 deg. 23' W. Medium-gray sandstone. Collector: R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
52ADt155A (Mesozoic loc. 24284) , Chandler Lake , Ninuluk formation, basal 100 ft of formation. Anaktuvuk River, west bank, lat 68 deg. 56'30" N., long 151 deg. 10'30" W. Sandstone and conglomerate. Collector, R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
52ADt168 (Mesozoic loc. 24285) , Chandler Lake , Ninuluk formation, basal part of formation. Anaktuvuk River, west bank, lat 68 deg. 51' N., long 151 deg. 09' W. Thick-bedded sandstone. Collector, R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 156)
Inoceramus (Inoceramus) dunveganensis McLearn
52ADt230 (Mesozoic loc. 24300) , Umiat , Station no. D-235, quadrangle 683 SE1/4 of NW1/4, Fossil Creek. Upper Nanushuk. Lithology: medium bedded s.s. (description from Imlay E&R report dated 1/15/53) [Ninuluk formation, basal part of formation. On hillside about 1 miles from small tributary of Ninuluk Creek, 69 deg. 05'30" N., long 152 deg. 38' W. Thin-bedded greenish sandstone. Collector, R.L. Detterman. (description from Jones and Gryc, 1960, p. 156)]
Inoceramus (Inoceramus) dunveganensis McLearn
52ABl273 (Mesozoic loc. 24271) , Umiat , Ninuluk formation, lower part of formation. On ridge east of small tributary of Fossil Creek, lat 69 deg. 07' N., long. 152 deg. 36' W. Thin-bedded green sandstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 157)]
Inoceramus (Inoceramus) dunveganensis McLearn
53ADt62 (Mesozoic loc. 24629) , Killik River , Ninuluk formation, basal 10 ft of formation. Killik River, northeast bank, about 10 miles upstream from Colville River, lat 69 deg. [note by R.B. Blodgett, lat. should be 68 deg.] 59' N., long 153 deg. 36' W. Thick-bedded, ferruginous sandstone. Collector, R.L. Detterman, 1953. (description from Jones and Gryc, 1960, p. 157)]
Inoceramus (Inoceramus) dunveganensis McLearn
53ADt84 (Mesozoic loc. 24630) , Ikpikpuk River , Ninuluk formation, basal 10 ft of formation. Colville River, north bank, about 4 miles downstream from Killik River, lat 69 deg. 04' N., long 153 deg. 52' W. Thick-bedded ferruginous sandstone and conglomerate, same as 24629. Collector, R.L. Detterman, 1953. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Inoceramus) dunveganensis McLearn
44AC525 (Mesozoic loc. 19435) , Umiat , Seabee formation, Unnamed member, 375-550 ft above base. Bluff on north side Colville River at Umiat Mtn., lat 69 deg. 23'30" N., long 152 deg. W. Dark fossiliferous shale with dark fossiliferous calcareous concretions and many light-colored bentonite laminae and thin beds. Forms conspicuous black cliff. Collector, R.R. Coats, 1944. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
46ASt3 (Mesozoic loc. 20424) , Umiat , Seabee formation, unnamed member. Stratigraphic position: Same as 19435. Locality and lithology same as 19435. Collector, K. Stefansson, 1946. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
46ARy68A (Mesozoic loc. 20413) , Ikpikpuk River , Seabee formation, unnamed member, 189 ft below top. Maybe Creek, north bank, 3.75 miles above mouth of September Creek, lat 69 deg. 19' N., long 154 deg. 19' W. Float of gray-brown fine-grained calcareous sandstone. Collector, R.G. Ray, 1946. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
Inoceramus aff. I. (Inoceramus) curvierii Sowerby, 1814
46ARy68b (Mesozoic loc. 20413) , Ikpikpuk River , Seabee formation, unnamed member, 189 ft below top. Location and lithology same as 46ARy68a. Collector, R.G. Ray, 1946. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
Inoceramus aff. I. (Inoceramus) curvierii Sowerby, 1814
46ARy131 (Mesozoic loc. 20420) , Ikpikpuk River , Seabee formation, unnamed member, 255-265 ft below top. Maybe Creek, north bank, 1.5 miles above mouth of Anak Creek, lat 69 deg. 16' N., long. 153 deg. 47' W. Dark-gray limestone concretions in black shale. Collector, R.G. Ray, 1946. (description from Jones and Gryc, 1960, p. 157); [Cobban and Gryc, 1961, p. 178 provide following description: "North bank of Maybe Creek 1 1/2 miles above junction with Anuk Creek. Lat. 69 deg. 16' N., long. 153 deg. 47' W. Seabee formation, 350-360 feet below top of the unnamed lower unit. R.G. Ray, 1946."]
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
47AWb63 (Mesozoic loc. 26545) , Chandler Lake , Seabee formation, unnamed member, about 850 ft below top. Nanushuk River, west bank, lat 68 deg. 50'30" N., long. 150 deg. 33' W. Bentonitic clay shale and limestone concretions. Collector, E.J. Webber, 1947. (description from Jones and Gryc, 1960, p. 157); [Cobban and Gryc, 1961, p. 179 provides following description: "West bank of Nanushuk River about 6 1/2 miles below junction with May Creek. Lat. 68 deg. 50'30" N., long. 150 deg. 33' W. Seabee formation. 860 feet above base. E.J. Webber, 1947."]
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
47AWb177 (Mesozoic loc. 26549) , Umiat , Seabee formation, unnamed member, about 1,100 ft below top. Nanushuk River, west bank, lat. 69 deg. 03' N., long. 150 deg. 51' W. Black papaer shale and limestone concretions. Collector, E.J. Webber, 1947. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
49ABe1 (Mesozoic loc. 26560) , Ikpikpuk River , Seabee formation, unnamed member, 255-265 ft below top. Lat 69 deg. 16' N., long 153 deg. 47' W. Same as 20420. Collector, W.P. Brosge, 1949. (description from Jones and Gryc, 1960, p. 157); [Cobban and Gryc, 1961, p. 179 provides the following description: "North bank of Maybe Creek 1 1/2 miles above junction with Anuk Creek. Lat. 69 deg. 16' N., long. 153 deg. 47' W. Seabee formation, 360-370 feet below top of the unnamed lower unit. W.P. Brosge, 1949."]
Inoceramus aff. I. (Inoceramus) curvierii Sowerby, 1814
51AGr34 (Mesozoic loc. 26563) , Chandler Lake , Seabee formation, unnamed member, 60-100 ft below top. Tuluga River, east fork, north bank, lat 68 deg. 50'45" N., long 151 deg. 25' W. Limestone concretions in shale. Collector, G. Gryc, 1951. (description from Jones and Gryc, 1960, p. 157); [Cobban and Gryc, 1961, p. 179 provides the following description: "North bank of eastern fork of Tuluga River. Lat. 68 deg. 50'45" N., long. 151 deg. 25' W. Seabee formation, 100-150 feet below top of the unnamed lower unit. George Gryc, 1951."]
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
Inoceramus aff. I. (Inoceramus) curvierii Sowerby, 1814
52ADt57 (Mesozoic loc. 26565) , Chandler Lake , Seabee formation, unnamed member, 160 ft below top. Ayiyak River, east bank, lat 68 deg 51'30" N., long 152 deg. 36' W. Interbedded silty shale, clay shale, siltstone, and sandstone. Collector, R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
52ADt61 (Mesozoic loc. 26566) , Chandler Lake , Seabee formation, unnamed member, 130 ft below top. Ayiyak River, east bank, lat 68 deg. 52' N., long 152 deg 33'30" W. Siltstone, silty shale and clay shale. Collector, R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
52ABl31 (Mesozoic loc. 24641) , Chandler Lake , Seabee formation, unnamed member, 20-30 ft below top. Ayiyak River, east bank, lat 68 deg. 52'30" N., long 152 deg. 32; W. Bentonitic clay shale and thin, green sandstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
52ABl33 (Mesozoic loc. 26568) , Chandler Lake , Seabee formation, unnamed member, near contact with Ayiyak member. Ayiyak River, east bank, lat 68 deg. 53' N., long 152 deg. 30'30" W. Bentonitic clay shale and green sandstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Mytiloides) labiatus (Schlotheim, 1813)
52ABl259 (Mesozoic loc. 26569) , Umiat , Seabee formation, unnamed member, 400-450 ft below top. On small tributary of Chandler River, lat 69 deg. 02'15" N., long 151 deg. 58' W. Bentonitic black paper shale and limestone concretions. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 157); [Cobban and Gryc, 1961, p. 179 provide following description: "On a small tributary of Chandler River about 12 1/2 miles north of junction with Siksikpuk River. Lat. 69 deg. 02'15" N., long. 152 deg. 04' W. Seabee formation, 200-250 feet above the base. R.S. Bickel, 1952."]
Inoceramus aff. I. (Inoceramus) curvierii Sowerby, 1814
47AWb264 (Mesozoic loc. 26533) , Umiat , Seabee formation, Ayiyak member, 130 ft below top. Nanushuk River, west bank, lat 69 deg. 04' N., long 150 deg. 50' W. Interbedded sandstone, siltstone, silt, and clay shale. Collector, E.J. Webber, 1947. (description from Jones and Gryc, 1960, p. 157)
Inoceramus aff. I. (Inoceramus) curvierii Sowerby, 1814
53ADt116 (Mesozoic loc. 24632) , Chandler Lake , Seabee formation, Ayiyak member, 300 ft below top. Nanushuk River, west bank, lat 68 deg. 50'30" N., long 150 deg. 32'30" W. Greenish-yellow sandstone and conglomerate. Collector, R.L. Detterman, 1953. (description from Jones and Gryc, 1960, p. 157)
Inoceramus aff. I. (Inoceramus) curvierii Sowerby, 1814
44AC522 (Mesozoic loc. 19434) , Umiat , Schrader Bluff formation, Barrow Trail member, 325-255 ft below top. Colville River, south side, prominent bluff near Umiat, about 7 miles southwest of Umiat Mtn., lat 69 deg. 29' N. [note by R.B. Blodgett: the lat. of 69 deg. 29' does not agree with verbal description of locality, the minute value is too high (possibly 19' was intended), long. 152 deg. 15' W. Seven-inch conglomerate and 25-foot tuffaceous sandstone. Collector, George Gryc, 1944. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
45AGr195 (Mesozoic loc. 20461) , Umiat , Schrader Bluff formation, Barrow Trail member, 250-350 ft above base. Chandler River, west bank at mouth of Kutchik River, lat 69 deg. 19' N., long 151 deg. 25' W. Tuffaceous sandstone. Collector, George Gryc, 1945. (from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
45AGr200 (Mesozoic loc. 20462) , Umiat , Schrader Bluff formation, Barrow Trail member, 200-300 ft above base. Chandler River, west bank, lat 69 deg. 20' N., long 151 deg. 25' W. Light buff sandstone. Collector, George Gryc, 1945. (from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
45AGr201 (Mesozoic loc. 20463) , Umiat , Schrader Bluff formation, Barrow Trail member, stratigraphic position same as above (referring to USGS Mes. loc. 20462). Locality, lithology, and collector: Same as above (referring to USGS Mes. locality 20462). (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
45AFs116f (Mesozoic loc. 20481) , Umiat , Schrader Bluff, formation, Barrow Trail member, upper 600 ft. Anaktuvuk River, east bank at Schrader Bluff, lat 69 deg. 10' N., long 150 [note by R.B. Blodgett: 150 deg. is an obvious mistake, what was probably meant was 151 deg.] deg. W. Tuffaceous sandstone and siltstone. Collector, R.E. Fellows, 1945. (from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
Inoceramus (Sphenoceramus) steenstrupi de Loriol, 1883
45AFs29 (Mesozoic loc. 20493) , Chandler Lake , Schrader Bluff formation, Barrow Trail member, exact [stratigraphic] position not known. Anaktuvuk River, east bank, lat 68 deg. 29' N., long 151 deg. 17' W. Collector, R.E. Fellows, 1945. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) steenstrupi de Loriol, 1883
47AWb136 (Mesozoic loc. 26498) , Chandler Lake , Schrader Bluff formation, Barrow Trail member, Lower 120 ft. Nanushuk River, northeast bank, lat 68 deg. 59'15" N., long 150 deg. 42' W. Laminated, tuffaceous sandstone. Collector, E.J. Webber, 1947. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
Inoceramus (Sphenoceramus) steenstrupi de Loriol, 1883
47ADt293 (Mesozoic loc. 26504) , Umiat , Schrader Bluff formation, Barrow Trail member, 220 ft below top. Colville River, south bank about 3.6 miles southwest of Umiat, lat 69 deg. 20'30" N., long 152 deg. 15' W. Tuffaceous sandstone. Collector, R.L. Detterman, 1947. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) steenstrupi de Loriol, 1883
48ADt387 (Mesozoic loc. 26508) , Umiat , Schrader Bluff formation, Barrow Trail member, 80-150 ft above base. Chandler River, east bank, lat 69 deg. 12'15" N., long 151 deg. 26'30" W. Tuffaceous siltstone, siltstone, and clay shale. Collector, R.L. Detterman, 1948. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
48ADt410 (Mesozoic loc. 26509) , Umiat , Schrader Bluff formation, Barrow Trail member, 540-600 ft above base. Chandler River, east bank, lat 69 deg. 13' N., long 151 deg. 25'30" W. Tuffaceous siltstone, silty shale, clay shale. Collector, R.L. Detterman, 1948. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
48ADt449 (Mesozoic loc. 26511) , Umiat , Schrader Bluff formation, Barrow Trail member, 900-1,040 ft above base. Chandler River, west bank at the junction of Kutchik River, lat 69 deg. 19'15" N., long 151 deg. 25' W. Siltstone and silty shale. Collector, R.L. Detterman, 1948. (description from Jones and Gryc, 1960, p. 157)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
52ADt175 (Mesozoic loc. 26515) , Umiat , Schrader Bluff formation, Barrow Trail member, 500-510 ft above base. Outpost Mtn., north side, about 1.5 miles west of Tuluga River, lat 68 deg. 10'30" N., long 151 deg. 08'45" W. Tuffaceous sandstone. Collector, R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 158)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
52ADt176 (Mesozoic loc. 26516) , Umiat , Schrader Bluff formation, Barrow Trail member. Outpost Mtn., about 1 mile southwest of 26515, lat 69 deg. 09'30" N., long 151 deg. 10' W. Tuffaceous sandstone. Collector, R.L. Detterman, 1952. (description from Jones and Gryc, 1960, p. 158)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
52ABl194 (Mesozoic loc. 26518) , Umiat , Schrader Bluff formation, Barrow Trail member, 670 ft above base. Outpost Mtn., south side, about 1 mile southwest of 26515, lat 69 deg. 09' N., long 151 deg. 09' W. Tuffaceous sandstone and siltstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 158)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
52ABl195 (Mesozoic loc. 26519) , Umiat , Schrader Bluff formation, Barrow Trail Member, 630 ft above base. Outpost Mtn., about 0.3 mile west of 26518, lat 69 deg. 09' N., long 151 deg. 10' W. Tuffaceous siltstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 158)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
52ABl197 (Mesozoic loc. 26521) , Umiat , Schrader Bluff formation, Barrow Trail member, 430-450 ft above base. Outpost Mtn., about 0.5 mile west of 26518, lat 69 deg. 09' N., long 151 deg. 10'45" W. Tuffaceous siltstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 158)
Inoceramus (Sphenoceramus) patootensis de Loriol, 1883
Inoceramus (Sphenoceramus) steenstrupi de Loriol, 1883
52ABl202 (Mesozoic loc. 26525) , Umiat , Schrader Bluff formation, Barrow Trail member, 430-450 ft above base. Outpost Mtn., lat 69 deg. 09'15" N., long 151 deg. 14'30" W. Tuffaceous sandstone and siltstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 158)
Inoceramus (Sphenoceramus) patootensis? de Loriol, 1883
52ABl203 (Mesozoic loc. 26526) , Umiat , Schrader Bluff formation, Barrow Trail member, 500-530 ft above base. Outpost Mtn., lat 69 deg. 09'30" N., long 151 deg. 13'30" W. Tuffaceous sandstone. Collector, R.S. Bickel, 1952. (description from Jones and Gryc, 1960, p. 158)
Inoceramus (Sphenoceramus) steenstrupi de Loriol, 1883