Vertipecten porterensis (Weaver, 1912)
WEAVER, C. E. 1912. A preliminary report on the Tertiary Paleontology of Western Washington. Washington Geological Survey, Bulletin, 12 [p. 57, pl. 8, figs. 70, 72]
1912 Pecten porterensis Weaver, 1912
C. E. Weaver, 1912, plate 8.
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«Description.— Shell slightly higher than long, inequivalve, equilateral. Margins somewhat serrate, base rounded; sides sloping above; sides considerably concave above, the posterior being more so than the anterior; right valve with twenty nearly equal slightly rounded radiating ribs, which are always dichotomous and often trichotomous, and begin so about 40 mm. from the beak; interspaces unequal, nearly twice as broad as the ribs and always ornamented by at least one auxiliary rib which begins near the beak and often attains at least one- half the size of the regular ribs. The four anterior interradlials are strongly imbricated or crenulated. Whole surface ornamented by very fine concentric striations; ears subequal; anterior ear with six radials and moderately fine concentric lines; byssal notch very pronounced; posterior ear with eight radials, strongly crenulated and truncated by a convex curve.
Dimensions.— Longitude 86 mm; altitude 100 mm; diameter 23 mm, Occurrence.— In the sandstones overlying the basalt, one mile west of Oakville, Chehalis County, in Northern Pacific railroad cut. Horizon.— Blakeley formation, Lower Miocene.» CHARLES EDWIN WEAVER, 1912
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«The genus ranges from the Gulf of Alaska to Washington in the upper Eocene upper Galvinian (the old "Lincoln") Stage of Armentrout (1975). Two Alaskan species, V. popofensis and V. lachenbruchi, were described by MacNeil (1967) from the Eocene to Oligocene Acila shumardi zone of Schenck (1936). More recently refined chronozones, based on species of Acila, restrict the A. shumardi zone and its Vertipectens to the late Eocene Galvinian Stage (Addicott, 1976c). These species and V. porterensis (Weaver, 1912) from Washington and V. yneziana from California constitute the oldest known Vertipectens. They are included, with V. columbianum (Clark and Arnold, 1923) from the Sooke Formation, Vancouver Island, in figure 12 to summarize the range data currently known for Vertipecten.»
SMITH, J. T. 1991. Cenozoic Giant Pectinids from California and the Tertiary Caribbean Province: Lyropecten, "Macrochlamis", Vertipecten, and Nodipecten species. United States Geological Survey Professional Paper, 1391: v + 1-155, figs. 1-18, pls. 1-38. [p. 37]
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«Supplementary description. In his description of P. porterensis, Weaver included only the right valve; his figure was that of a very poor and imperfectly preserved specimen. But, at the same time, he figured a left valve, of which he makes no mention. This valve, as is true of many of the species belonging to this subgenus, has a considerably different sculpture from that of the right, the surface being covered by about 18 to 20 fairly heavy ribs, variable in width and prominence. Interspaces about equal to or wider than tops of ribs ; on top of each rib is raised ridge or riblet, and there is a riblet in each interspace. Whole surface of shell beautifully imbricated. (Clark, 52, p. 83)
Observations. This species resembles P. nevadanus var. perrini Arnold and perhaps it should be considered a variety of P. nevadanus.
Syntype. (U.W. 45a) (C.A.S. 543). Figured in the present report, pl. 19, fig. 1. Syntype. (U.W. 45) (C.A.S. 542). Figured in the present report, pl. 19, fig. 8. Hypotype. (S.U. 19.) Figured in the present report, pl. 19, fig. 4. Hypotype. (S.U. 18.) Figured in the present report, pl. 16, fig. 4. Geologic range. Lower middle Oligocene. Type locality. (U.W. 169.) In old quarry in sandstone overlying Eocene basalt, one mile west of Oakville, along track of Northern Pacific Railway in Grays Harbor County, Section 19, T. 16 N., R. 4 W.»
WEAVER, C. E. 1943. Paleontology of the marine Tertiary formations of Oregon and Washington. University of Washington Publications in Geology, Volume. 5 [1942], (parts 1-3), p. 1-789, pls. 1-104. [p. 87]
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Pecten (Vertipecten) porterensis Weaver, 1912. C. E. Weaver, 1943, Paleontology of the marine Tertiary formations of Oregon and Washington, plate 16, figure 4; plate 19, figures 1, 4, 8.
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«Pecten porterensis Weaver, Wash. Geol. Survey, Bull. No. 15, p. 57, pl. 8, figs. 70, 72, 1912.
? Pecten (Lyropecten) gabbi Clark, Univ. Calif. Publ. Geol., Vol. 11, p. 131, pi. 15, figs. 1, 2, 1918, not Pecten gabbi Dall, Trans. Wagner Free Inst. Sci., Phila., Vol. 3, p. 717, pl. 29, fig. 3, 1898. Not "Pecten (Chlamys) porterensis Weaver" Clark and Arnold, Univ. Calif. Publ. Geol., Vol. U, pl. 24, fig. 1, 1923; Clark, Vol. 15, p. 83, pl. 11, fig. 1, 1924. ? Pecten diabloensis Clark in Hanna, Proc. Calif. Acad. Sci., Ser. 4, Vol. 13, p. 176, 1924, new name for Pecten gabbi Clark, not Pecten (Lyropecten) diabloensis Arnold, Prof. Paper 47 U. S. Geol. Survey, p. 72, 1906, a distorted specimen of crassicardo. This form is so close to P. nevadanus variety perrini that the writers cannot tell from the poor specimens figured how to distinguish it. The type specimen of Clark's name is even worse, so that it is difficult to be sure even that it belongs to Vertipecten; but the fiat right valve and the character of the ribs of the two valves indicate that it probably belongs here, and being of the same age it is questionably referred to Weaver's form. So far, there are no authentic records of a Lyropecten in the Oligocene of the Pacific coast, and it is doubtful that Clark's specimen could be a Lyropecten. It is true that the illustration resembles somewhat the figure of Pecten (Lyropecten) vaccamavensis Olsson¹ from the supposed Miocene of North Carolina, but the true similarity probably ends with the fact that both specimens are very poor. In 1924 Hanna discovered that the name gabbi had been preoccupied, and Clark suggested the new name diabloensis; but fortunately that name was preoccupied also. It seems better not to try to find another name for it until better specimens are found, when it is hoped that it will be possible to tell whether it is different from porterensis and nevadanus or not; and at that time a better specimen can be made the type. In the meantime, the forms can be referred questionably to porterensis.»
¹ Pecten (Nodopecten) vaccamavensis Olsson, Bulls. Amer. Paleo., Vol. 5, p. 49 (or Bull. 24, p. 11). pl. 8, fig. 1, 1914.
GRANT, U. S. IV & H. R. GALE. 1931. Catalogue of the marine Pliocene and Pleistocene Mollusca of California and adjacent regions. Memoirs of the San Diego Society of Natural History, Volume 1, 1036 pp., pls. 1-32, 15 text figs.[p. 191]
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Pecten (Lyropecten) gabbi, n. sp.; B. L. Clark, 1918, The San Lorenzo Series of middle California, plate 15, figures 1, 2.
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