Leptopecten discus (Conrad, 1857)
CONRAD, T. A. 1857. Report on the paleontology of the Survey [Parque's Survey]. In Reports of explorations and surveys railroad from the Mississippi River to the Pacific Ocean. Senate Executive Document, 78 and House of Representatives Executive Document, 91 (7): 189-196 [Reprinted in Dall 1909: 180-185] [p. 190, pl. 3 fig.1]
1857 Pecten discus Conrad, 1857
1915 Pecten (Pecten) raymondi Clark, 1915
1915 Pecten (Pecten) cierboensis Clark, 1915
1922 Pecten (Pecten) raymondi brionianus P. D. Trask, 1922
1922 Pecten (Pecten) andersoni gonicostus P. D. Trask, 1922
1915 Pecten (Pecten) raymondi Clark, 1915
1915 Pecten (Pecten) cierboensis Clark, 1915
1922 Pecten (Pecten) raymondi brionianus P. D. Trask, 1922
1922 Pecten (Pecten) andersoni gonicostus P. D. Trask, 1922
T. A. Conrad, 1857, plate 3.
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«PECTEN DISCUS, Pl 3, fig. 1.— Suborbicular, slightly oblique, profoundly compressed or discoidal, thin; ribs about 17, rather distant, not very prominent, narrow, subtriangular, slender, and more distant toward the lateral margins; ears very unequal, rather small.
Locality.— Between La Purisima and Santa Ynez. This species is described from a cast beautifully preserved in indurated clay. The height is about 2 inches. The upper valve appears to have been nearly flat.» TIMOTHY ABBOT CONRAD, 1857
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«Clark (in Kew 1924, p. 68) identified Chlamys raymondi from the Castaic Formation in the general area of locs. 232 and 1670. Shells referrable to C. raymondi have been found in this study but appear to be part of a gradational se- ries encompassing both C. raymondi and C. discus and grouped most closely around the typical C. discus.»
STANTON JR., R. J. 1966. Megafauna of the upper Miocene Castaic Formation, Los Angeles County, California. Journal of Paleontology, 40 (1): 21-40, figs. 1-2, pls. 5-7. [p. 27]
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