Amusium mortoni (Ravenel, 1844)
RAVENEL, E. 1844. Description of some new species of fossil organic remains from the Eocene of South Carolina. Proceedings of the Academy of Natural Sciences of Philadelphia, vol. 2: 96-98. [p.96]
Pecten Mortoni Rav., M. Toumey & F.S. Holmes, 1857, Pleiocene fossils of South Carolina, plates 9 and 10.
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«1. Pecten Mortoni. Specific character — Orbicular, thin, both valves moderately convex, one more so than the other- outside, with numerous concentric obsolete striae; inside, with from eighteen to twenty-four radiating double ribs, slightly elevated; ears large, sub-equal, striated externally.
This species is nearly allied to the P. pleuronectus and P. japonicus. It is found in the limestone on my plantation. The Grove, in St. Thomas's Parish, about 17 miles from Charleston, and also on Goose creek, at Mr. Henry Smith's, about 7 miles South West from the Grove deposite, and 11 miles from Charleston; Cooper River being between these two localities. This shell is abundant at the Grove, but being large and thin, it is generally broken in getting out the marl, and with the exception of a few small specimens, I have not been able to procure a perfect valve. The largest specimen in my possession although not perfect, is sufficiently so to determine its size; it is 8 ¾ inches in diameter. I take much pleasure in designating this shell by the name of our distinguished Geologist, Dr. Samuel George Morton, of Philada.» EDMUND RAVENEL, 1844
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«Species of American Neogene Amusium that lack external radial ribs on their umbones and are thus comparable to A. papyraceum are A. toulae (Brown & Pilsbry, 1911) [junior synonyms Pecten (Amusium) luna Brown & Pilsbry, 1913, and possibly A. bocasense Olsson, 1922], A. mortoni (junior synonym Amusium rexmaris Maury, 1925a), A. darwinianum (d'Orbigny, 1842), and A. paris del Río, 1992.»
WALLER, T. R. 2011. Neogene Paleontology of the Northern Dominican Republic. 24. Propeamussiidae and Pectinidae (Mollusca: Bivalvia: Pectinoidea) of the Cibao Valley. Bulletins of American Paleontology, 381: 1-197, pls. 1-18. [p. 98]
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«Occurrence: Upper Miocene: Ecphora zone — station 2210, upper bed at Alum Bluff, Liberty County (one valve of young); station 1/962, cut in old road leading to Watsons Landing, Liberty County (fragments); station 3423, lower upper Miocene bed at Jackson Bluff, Leon County (fragment). Cancellaria zone — station 1/706, Gully Pond, Washington County (fragments); stlation 3671, 2 miles north of Hosford, Liberty County (frafmen); station 7474, Rock Creck near Knox Slill Landing, Franklin County (two fragments); borrow pit, Jackson Bluff, Leon County (good specimens).
Outside occurrence: Miocene: Yorktown formation, highest zone, station 2831 (near Suffolk, Va.), station 2835 (Nansemond River, 18 miles below Suffolk, Va.). Duplin Marl of the Carolinas. Pliocene: Florida. Dall [60] reported this species from Fairhaven and Drum Point, Md., by apparently misreading the station numbers. The U. S. Geological Survey numbers on the specimens are 2831 and 2835. Both specimens have Cat. No. 146218, U. S. N. M. The localities recorded for these numbers are Suffolk and 16 miles below Suffolk, Va. However, a few specimens representing young individuals were collected by the late Frank Burns, of the Unitcd States Geological Survey, from the Calvert formation at Plum Point, Md., station 3198. These specimens have faint radials on the ears, a feature which I do not observe on A. mortoni, and probably represent another species.» MANSFIELD, W. C. 1932b. Miocene Pelecypods of the Choctawhatchee Formation of Florida. Florida Geological Survey Bulletin, 8: 7-164, pls. 1-34. [p. 65]
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Amusium mortoni (Ravenel); W. C. Mansfield, 1932, Miocene Pelecypods of the Choctawhatchee Formation, plate 11, figures, 2, 4.
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