Spondylus cliffensis M. A. Hanna, 1927
HANNA, M. A. 1927. An Eocene invertebrate fauna from the La Jolla quadrangle, California. University of California Publications, Bulletin of the Department of Geological Sciences, 16 (8): 247-398, pls. 24-57. [p. 278, pl. 32, figs. 2, 7]
1927 Spondylus cliffensis M. A. Hanna, 1927
M. A. Hanna, 1927, plate 32.
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«Type.— No. 31025, Univ. Calif. CoIl. Invert. Pal.; U. C. loc. 5062.
Paratype.— No. 31026, Univ. Calif. Coll. Invert. Pal.; U. C. loc. 5062. Description of type.— Shell small, inequilateral, subcircular, only slightly inflated; beaks not prominent or central; hinge line straight; surface distorted; ornamented by many small prominent sharp round-topped ribs of various sizes; usually large ribs alternate with smaller ones, every third to fifth large rib more prominent, some of the very large ribs appear to be noded; surface crossed by a few indistinct growth lines. Dimensions. Altitude 25.5 mm., length 29 mm.» MARCUS ALBERT HANNA, 1927
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«Spondylus cliffensis Hanna (1927, p. 278, PI. 32, figs. 2, 7) is the only other Spondylus known from the Eocene of the west coast of North America. This species, known only from "Domengine Stage" strata in southern California (Hanna, 1927), lacks spines.»
SQUIRES, R. L. & R. DEMETRION. 1990. New Eocene marine bivalves from Baja California Sur, Mexico. Journal of Paleontology, 64 (3): 382-391, figs. 1-4. [p. 386]
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«Holotype.— UCMP 31025.
Type locality.— UC 5062. San Diego County, Calif. Rose Canyon Shale (Hanna, 1926), Eocene. Comparison.— Spondylus cliffensis is smaller and seems to have a longer hinge line than S. carlosensis (Vokes, 1939, p. 57). Geographic range.— Southern California. Geologic range.— Eocene. Occurrence in California.— Eocene: Rose Canyon Shale (Hanna, 1927).» MOORE, E. J. 1987. Tertiary Marine Pelecypods of California and Baja California: Plicatulidae to Ostreidae. United States Geological Survey Professional Paper, 1288-C: C1-C53, pls. 1-34. [p. C7]
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Spondylus cliffensis M. A. Hanna; E. J. Moore, 1987, Tertiary Marine Pelecypods of California and Baja California: Plicatulidae to Ostreidae, plate 2, figure 3.
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