Patinopecten coosensis (Shumard, 1858)
SHUMARD, B. F. 1858. Descriptions of New Fossils from the Tertiary Formation of Oregon and Washington Territories and the Cretaceous of Vancouver's Island, collected by Dr. Jno. Evans U.S. Geologist, under instructions from the Department of the Interior. Transactions of The Academy of Science of St. Louis, 1: 120-125. [p. 122]
1858 Pecten coosensis Shumard, 1858
Pecten (Patinopecten) coosensis Shumard; W. H. Dall, 1898, Contributions to the Tertiary fauna of Florida, pl. 26, fig. 2.
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«Shell large, suborbicular, much compressed; valves flattened convex, the superior one more depressed than the other; surface ornamented with from twenty-seven to thirty-one coarse, radiating, prominent ribs, which are flattened, and marked with an obscure, median, longitudinal groove toward the palleal margin; on the inferior valve the ribs are about equal in width to the spaces, but on the superior one the spaces are much the widest; ribs and spaces crossed by numerous fine, subimbricating, concentric striae of growth; ears nearly equal, those of superior valve marked with distint striae, and folds running parallel with their lateral borders; those on the anterior one are crossed by from six to eight indistint, radiating ribs; anterior ear of lower valve deeply emarginate for the passage of the byssus, striated, and marked with three or four rather broad, radiating ribs; striae of posterior ear nearly vertical; ligamentary pit triangular and rather deep.
Apicial angle excluding ears, 100º. This species is subject to more or less variation. In some specimens we finf the ribs of the middle of the shell bearing a longitudinal, slightly elevated, rounded catina, with a shalow groove on either side, while toward the lateral margins they are marked only with a single median groove. In other specimens the ribs exibit merelya plane surface, without groove or carina. Form. & Loc.— This fine species Dr. Evans found in great profusion at the mouth of Coose Bay, is slightly coherent sandstone of the Miocene period.» BENJAMIN FRANKLIN SHUMARD, 1858
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«The right valve bears 27 or 28 flattopped, undercut, flanged ribs, and these ribs are irregularly grooved near the ventral margin.
The interspaces are slightly narrower than the ribs or are of the same width. The left valve has ribs that are sharply rounded at the anterior and posterior margins and slightly flattened on the remainig shell. The interspaces are slightly wider than the ribs and are evenly rounded. Patinopecten coosensis has more ribs than Patinopecten propatulus of early to middle Miocene Age, and these ribs are higher and more undercut.» MOORE, E. J. 2000. Fossil shells from Western Oregon. A guide to identification. Chimtimini Press. Corvallis, Oregon. [p. 94, 95]
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Patinopecten coosensis (Shumard); E. J. Moore, 2000, Fossil shells from Western Oregon, figure page 94.
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«Description.— Shell averaging about 110 millimeters in altitude, slightly longer than high, valves both well compressed, equilateral, and with margins smooth; sides only slightly concave, and sloping at only a moderately low angle. Right valve with 29 to 31 prominent T-rail shaped ribs, flattened and sometimes faintly dichotomous above, overhanging narrow, deep, almost flat-bottomed channels; whole surface sculptured with more or less prominent fine concentric lines; hinge line nearly equal to one-half length of disk; anterior ear slightly produced and sculptured by radiating ridges and imbricating concentric lines; byssal notch wide and deep; posterior ear rectangularly truncated, and sculptured by sharp incremental lines and sometimes by obsolete radial ridges. Left valve with narrower, rounded, concavesided. ribs and wider, round-bottomed interspaces; sculpture of numerous, sharp, raised, concentric lines; ears subequal, and having incremental and sometimes obsolete radial sculpture.
Dimensions.— Alt. 110 mm.; long. 115 mm.; hinge line 54 mm.; diameter 26 mm. This fine species is distinguishable by the great number and shape of its ribs. Specimens found at Howe's place, northeast of Corvallis, Benton County, Oreg., have only from 25 to 27 ribs on the right valve. Otherwise the specimens are similar to the typical form. Found abundantly in the Empire beds at Coos Bay, Oregon, whence the type came. RANGE
Miocene. Coos Bay, Oregon (Shumard; Dall; A. W. Crawford and others); Howe's place, northeast of Corvallis, Benton County, Oreg. (Diller).»
ARNOLD, R. 1906. The Tertiary and Quaternary pectens of California. United States Geological Survey Professional Paper, 47: 1-264, pls. 1-53. [p. 61, 62]
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Pecten (Patinopecten) coosensis Shumard; R. Arnold, 1906, The Tertiary and Quaternary pectens of California, plate 6, figure 2; plate 7, figures 2, 2a.
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