Camptonectes platessiformis White, 1880
WHITE, C. A. 1880. Contributions to invertebrate paleontology No. 7; Jurassic fossils from the Western Territories. United States Geological and Geographical Survey of the Territories, 12th Annual Repport (1878), part I: 143-153, pls 37, 38. [p. 143, pl. 37, fig. 5a]
1880 Camptonectes platessiformis White, 1880
C. A. White, 1880, plate 37.
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«Camptonectes platessiformis White, 1876, Powell's Eep. Geol. Uinta Mts., p. 93.
Camptonectes extenuatus Whitfield, 1877 (not Meek & Hayden), Prelim. Rep. Paleont. Black Hills, p. 47. Shell, exclusive of the ears, subelliptic in marginal outline, the height being considerably greater than the width; the whole border below the ears forming a continuous and almost true elliptic curve; hinge line moderately long. Left valve gently convex; the ears moderately large, nearly rectangular, subequal, the anterior one perhaps slightly larger and a little more prominent than the other, defined from the body of the shell by their flattening and not by distinct auricular furrows; umbonal portion of the valve well defined by its straightened sides converging to the beak, which is small and projects little, if any, beyond the cardinal border. Surface marked by numerous comparatively coarse, radiating, crenulated, raised lines, which, near the base, begin to be curved outward to the margins, the curvature of the lines increasing towards the upper portion of the sides so that upon the space just below each ear they have a distinctly backward curvature. Eight valve unknown.
Height from base to beak, 30 millimeters; breadth, 26 millimeters. Position and locality.— The type of this species was discovered in Jurassic strata at the north base of Aquarius Plateau, Southern Utah. Professor Whitfield also reports its existence (loc.cit.) in Jurassic strata of the Black Hilis, but refers it to the C. extenuatus of Meek & Hayden The last-named species, however, as described and figured by its authors is a smooth or nearly smooth one, and has a different marginal outline.» CHARLES ABIATHAR WHITE, 1880
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«Description: Shell is subovate in shape, higher than long and markedly convex. Ornament consists of radiating ribs which are crossed by concentric ribs which become dominant as the margin is approached.
Figured specimen: JM175. From Pan Am. A-I Scotsguard Crown 13-36 well in Lsd. 13, Sec. 36, Twp. 8, Rge. 17 W. 3rd. Meridian, Saskatchewan. Depth 4638 feet, in calcilutite 6 feet below the top of the upper member of the Shaunavon Formation.
Remarks: Only one specimen was identified as belonging to this species. It lacks ears and hinge and was identified from its shape and ornament.»
PATERSON, D. F. 1968. Jurassic megafossils of Saskatchewan with a note on Charophytes. Department of Mineral Resources, Geological Sciences Branch, Sedimentary Geology Division. Report No. 120: 135 p., pls. 1-26. [p. 41]
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Camptonectes platessiformis White; D. F. Paterson, 1968, Jurassic megafossils of Saskatchewan with a note on Charophytes, plate 12, figures 4a, 4b.
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