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50AHr17
, Russian Mission
, Near base of a prominent rock bluff, north side of Kuskokwim River, about 2 1/2 miles downstream of Aniak, Alaska. This is the first point below Aniak where the main river channel cuts bedrocks. The fossil horizon is a 6-8-foot bed of crystalline limestone containing fragments of volcanic rocks which is interbedded with argillitc and tuffaceous rocks. (all above information from transmittal form of Hoare)
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fragments of other fossils
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50AHr25
, Russian Mission
, Near the base of a low (40-50 foot) rock bluff, north side of Kuskokwim River, about 10-12 river miles below Aniak, Alaska. The fossil horizon is accessible only during low water. The fossil horizon is 20 to 30 feet of hard, crystalline limestone exposed over a strike distance of about 150 feet. The east end is covered by alluvium; the west end is terminated by a fault. The limestone is interbedded with altered volcanic rocks. The limestone is the same age as the volcanic rocks for it grades into them on both upper and lower contacts. (all above information from transmittal form of Hoare)
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impressions and fragmentary remains of parts of several brachiopods (mostly spiriferoids)
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Spiriferella arctica (Houghton)
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50AHr378-A
, Goodnews Bay
, 28 1/4 miles S 51 1/2 deg. W of outlet of Lake Kagati. 14 miles N 25 deg. W of outlet of Goodnews Lake. 1 1/2 miles N of a small cirque lake. On a small, low limestone ridge which trends NE and lies near the north side of the lowland between (and near the heads of) the two major forks of Nukluk Creek. Fossils came from the upper one-third of a 50-70-foot bed of crystalline limestone. Near the bottom the limestone weathers to a buff and greenish and is probably tuffaceous. The middle portion is quite massive. Near the top, the limestone is thin-bedded and probably tuffaceous. Immediately underlying the limestone is green chert and tuffs. Overlying the limestone is amygdaloidal lava. (all above information from transmittal form of Hoare)
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Spiriferella arctica (Houghton)
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few indeterminate fragments of other brachiopods
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50AHr392
, Goodnews Bay
, 24 1/2 miles S 66 deg. W of outlet of Lake Kagati. 18 1/2 miles N 14 1/2 miles W of outlet of Goodnews Lake. 4 miles S 3 1/2 deg. W of mouth of Klak Creek. On the crest of and about 1 mile from the northeast end of the high, isolated ridge which lies south of Kanektok River between Nukluk Creek and first stream west of Klak Creek. Fossils came from a highly fossiliferous bed of tuffaceous limestone 5-10 feet thick. Overlying the fossil horizon is at least 400 feet of massive and thin-bedded crystalline limestone which is tuffaceous in places throughout its thickness and, in general, becomes increasingly tuffaceous toward the base. The fossil horizon grades downward into chert and fine-grained volcanic rocks several hundred feet thick. (all above information from transmittal form of Hoare)
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Spiriferella arctica (Houghton)
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Productus or Marginifera aff. M. aagardi (Toula)
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Camerophoria (Stenoscisma of recent usage)
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probably Spiriferina (Punctospirifer of recent authors)
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fragments representing other genera of brachiopods
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50AHr394-C
, Goodnews Bay
, 26 1/2 miles S 62 1/2 deg. W of outlet of Kagati Lake. 17 1/4 miles N 20 1/2 deg. W of outlet of Goodnews Lake. 5 3/4 miles S 17 deg. W of mouth of Klak Creek. On the crest of and about 6 1/4 miles from the northeast end of the high, isolated ridge which lies south of Kanektok River between Nukluk Creek and the first stream west of Klak Creek. Fossils came from a small exposure of crystalline limestone which apparently overlies the same chert and fine-grained volcanic rocks as mentioned above, but at this point the thick overyling limestone has been removed by erosion. (all above information from transmittal form of Hoare)
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Spiriferella arctica (Houghton)
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large Spirifer, probably of the S. condor-type
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productid or Marginifera, referred to M. septentrionalis (Tschernyschew)
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