Reference Detail of

Report on Referred Fossils
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Stratigraphic range: Late Jurassic and basal Cretaceous
Kinds of fossils: Mollusks
Quadrangle or area: Sitka B-1 & Sumdum B-6
Shipment No.: A-58-11
Referred by: Loney, R. A.
Report prepared by: Imlay, Ralph W.
Date: 12/15/1958

Most of the fossils in the collections submitted belong to the pelecypod Buchia, (formerly referred to Aucella which has been ruled invalid). This genus began in the late Oxfordian stage of the Late Jurassic and survived into the Hauterivian stage of the Early Cretaceous. In the West Coast of the United States it is not known above the Valanginian. ....

It is strange that you did not find any specimens of B. okensis or B. subokensis Pavlow, which is common at the base of the Cretaceous in northern Alaska, and has been found also, in southeastern Alaska at Slocum Arm on the west side of Chichagof Island (Mes. loc. 10147). Your collections lacked also, any specimens of Buchia piochii (Gabb) which is present in several older collections (Mes. locs. 8851, 10095, 10169) obtained at the east end of the point separating the arms of Pybus bay. These specimens are not distorted as are all the others from Admiralty Island.

A similar sequence of species of Buchia has been found by J.A. Jeletzky on the west coast of Vancouver Island (Geological Survey of Canada Paper 50-77, p. 30 to 43). Until he publishes illustrations, comparisons will be difficult.

The fossils are listed by localities as follows:

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58ALy87F (Mesozoic loc. 27066) , Sitka , Transmittal sheet of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate, dark, gray, and scattered 1"-2" graywacke beds-Jurassic lithology poor ammonite cast. Coord: 8.08, 5.94.
Buchia sp.
Spiticeras? sp.
58ALy230dF (Mesozoic loc. 27067) , Sitka , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate, dark gray and thin light gray, slightly calc. graywacke beds-Jurassic-Cretaceous lithology-Brachiopods? Coord: 9.12, 5.80.
Camptonectes sp.
58ALy231aF (Mesozoic loc. 27068) , Sitka , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate, dark gray-Jurassic-Cretaceous lithology-Aucella poorly preserved. Coord: 9.10, 5.64.; USGS Mesozoic Iocs. 3271, 3309, 8851, 10095, 10169, 27068, 27071-73, 27334, and 27335 from Pybus Bay area in southeastern part of Admiralty Island, southeast Alaska (Loney, 1964, p. 97). Buchia rugosa (Fischer). (description from Imlay and Detterman, 1973, p. 26); [USGS Mes. Cat.: 27068. 58ALy231a. Upper Jurassic. Slate, dark gray, Sitka quad., Coordinates 9.10, 5.64, Admiralty Island, SE Alaska. Coll. by R.A. Loney, 1958.]
Buchia cf. B. rugosa (Fischer)
58ALy260F (Mesozoic loc. 27069) , Sumdum , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate, med. dark gray and scattered 1/2"-1" lensatic, calc. graywacke beds. Typical Jurassic-Cretaceous lithology. Aucellas. Coord: 2.00, 5.30.
Buchia cf. B. volgensis (Lahusen)
Spiticeras? sp.
58ALy266(000)F (Mesozoic loc. 27070) , Sumdum , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate, dark gray very sparse 1" graywacke beds - Jurassic-Cretaceous lithology - Island outcrop - top of sections - Aucellas. Coords: 0.78, 3.38.
Buchia rugosa (Fischer)
58ALy266(020)F (Mesozoic loc. 27071) , Sumdum , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate as 266(000)-about 175' stratigraphically below (000)-Aucella. Coords: 0.76, 3.34.; USGS Mesozoic Iocs. 3271, 3309, 8851, 10095, 10169, 27068, 27071-73, 27334, and 27335 from Pybus Bay area in southeastern part of Admiralty Island, southeast Alaska (Loney, 1964, p. 97). Buchia rugosa (Fischer). (description from Imlay and Detterman, 1973, p. 26); [USGS Mes. Cat.: 27071 58ALy266(020). Upper Jurassic slate as 226(000), but about 175' strat. lower, coordinates 0.76, 3.34, Sumdum B-6 quad., SE Alaska. Coll. by R.A. Loney, 1958]
Buchia rugosa (Fischer)
58ALy270bF (Mesozoic loc. 27072) , Sitka , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate, dark gray and abundant 1/4"-1/2" graywacke beds - Typical Jurassic-Cretaceous lith. Aucellas. Coords: 12.20, 4.88; USGS Mesozoic Iocs. 3271, 3309, 8851, 10095, 10169, 27068, 27071-73, 27334, and 27335 from Pybus Bay area in southeastern part of Admiralty Island, southeast Alaska (Loney, 1964, p. 97). Buchia rugosa (Fischer). (description from Imlay and Detterman, 1973, p. 26);[USGS Mes. Cat.: 27072 58ALy270b. Upper Jurassic slate, dark gray & abundant 1/4"-1/2" graywacke beds, Sitka B-1 quad., coords: 12.20, 4.88, Admiralty Island, S.E. Alaska. Coll. by R.A. Loney, 1958]
Buchia rugosa (Fischer)
58ALy275F (Mesozoic loc. 27073) , Sitka , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate, dark gray and very sparse 1/4"-1/2" graywacke beds, typical Jurassic-Cretaceous lithology. Aucellas Coord: 10.76, 5.46.; USGS Mesozoic Iocs. 3271, 3309, 8851, 10095, 10169, 27068, 27071-73, 27334, and 27335 from Pybus Bay area in southeastern part of Admiralty Island, southeast Alaska (Loney, 1964, p. 97). Buchia rugosa (Fischer). (description from Imlay and Detterman, 1973, p. 26); [USGS Mes. Cat.: 217073. 58ALy275. Upper Jurassic slate, dark gray & very sparese 1/4"-1/2" beds of graywacke, Sitka B-1 quad, coords. 10.76, 5.46, Admiralty Island, SE Alaska. Coll. by R.A. Loney, 1958]
Buchia rugosa (Fischer)
58ALy278F (Mesozoic loc. 27074) , Sitka , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Slate, dark gray and sparse calc., 1" graywacke beds - Jurassic-Cretaceous lithology - Aucellas(?) Coords: 8.48, 5.12.
Pleuromya sp.
Lima sp.
58ALy324aF (Mesozoic loc. 27075) , Sumdum , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Gaywack, med. gray, med. grained, massive with pebbly lenses, slightly calcareous. Prob. Jurassic-Cretaceous-shells scattered through one pebbly layer. Coords: 3.10, 5.78.
Buchia sp.
58ALy338aF (Mesozoic loc. 27076) , Sumdum , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Dark gray slate with abundant 1/2" graywacke beds-stratigraphically close to 338-Aucellas. Coords: 5.22, 14.86
Buchia sp.
58ALy338F (Mesozoic loc. 27077) , Sumdum , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Dark gray, slate containing v. sparse 1/2" graywack beds-typical Jurassic-Cretaceous lithology - Aucellas. Stratig. position unknown. Coords: 5.32, 14.72.
Buchia cf. B. volgensis (Lahusen)
58ALy409aF (Mesozoic loc. 27078) , Sumdum , Transmittal sheets of R.A. Loney, dated Nov. 6, 1958 provide following description: Dark gray, slate and occasional light grayish yellow weathering dark gray, limestone concretion - poorly preserved pelecypod - Typical Jurassic-Cretaceous lithology - Stratig. position unknown. Coords: 2.90, 15.98.
Buchia? sp.