Camptonectes stygius White, 1874
WHITE, C. A. 1874. Preliminary report upon invertebrate fossils collected by the expeditions of 1871, 1872, and 1873, with descriptions of new species. Engineer Department, U. S. Army. Geographical and Geological Explorations and Surveys West of the One Hundredth Meridian, 27 p. Government Printing Office. Washington. [p. 23]
1874 Camptonectes stygius White, 1874
Camptonectes stygius; C. A. White, 1877, Report upon the invertebrate fossils collected in portions of Nevada, Utah, Colorado, New Mexico, and Arizona, plate 13, figures 2a-2c.
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«CAMPTONECTES STYGIUS (sp. nov.) — Shell of medium size, thin, lenticular; length of the hinge-line a little more than half the height of the shell from basal margin to beak, very slightly obIique with the axis, which inclines a little posteriorly, although it does not at first view appear to, because a trifie more than one-half the width of the shell is in front of it; the margins of the lower two-thirds regularly rounded, the basal portion having rather a shorter curve than either the anterior or posterior portion.
Hight valve smooth, depressed-convex; posterior ear rather small, plain, its outer border forming a somewhat obtuse angle with the cardinal border; anterior ear moderately large, prominent, proportionally narrow, the upper and lower sides approaching each other at an acute angle anterior border extending farther forward than the extremity of the anterior ear, at which part it is abruptly rounded and then continued backward and upward almost straight to the bottom of the byssal notch. Surface nearly smooth, but concentric lines and striae of growth are visible, and in a favorable light indications of radiating costae may also be observed. Height from base to beak, forty-one millimeters; width, forty millimeters; length of hinge-border, twenty-three millimeters. This shell resembles C. bellistriatus Meek and Hayden, from the Jurassic strata of Dakota, but it differs in the outline of the borders, the shape of the ears and byssal notch, and in the surface-markings. Position and locality.— "Edge of the bluff, fifteen to twenty miles south of Dirty Devil River, and upon the Xorth Fork of Virgin River, Utah." Rocks of Jurassic age.» CHARLES ABIATHAR WHITE, 1874
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«Description: Shell is thin, sub-circular, only slightly higher than long. It is moderately convex with prominent ears, the anterior much larger than the posterior and with a deep byssal notch below the anterior ear of the right valve. The hinge line is about half the length of the shell. Ornament is slight and mainly of inconspicuous concentric growth lines and a few very faint radiating striae.
Figured specimen: JM176. From Socony Woodley Southern West IIlerbrun 2-3 well in Lsd. 3, Sec. 2, Twp. 11, Rge. 19 W. 3rd. Meridian, Saskatchewan. Depth 4430 feet, in limestone 13 feet above the base of the upper member of the Shaunavon Formation.
Remarks: Some 29 specimens were found in Area I, none were identifiable in other areas.»
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, 42]
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Camptonectes stygius White; D. F. Paterson, 1968, Jurassic megafossils of Saskatchewan with a note on Charophytes, plate 12, figures 5a, 5b.
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