Amusium ocalanum Dall, 1898
DALL, W. H. 1898. Contributions to the Tertiary fauna of Florida. Silex Beds of Tampa and the Pliocene Beds of the Caloosahatchie River. Part IV. I. Prionodesmacea: Nucula to Julia. 2. Teleodesmacea: Teredo to Ervilia. Transactions of the Wagner Free Institute of Science of Philadelphia, 3 (4): i-viii, 571-947, pls. 23-35. [p. 756, pl. 29, fig. 2]
1898 Pecten (Amusium) ocalanus Dall, 1898
W. H. Dall, 1898, plate 29.
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«Oligocene of the Vicksburgian at Natural Bridge, Alachua County; at various localities in Levy County; at Arredonda and Archer; Newnansville and Johnson's lime sink; and in the Nummulitic horizon at Ocala and Martin Station, Marion County, Florida; also in the Vicksburgian of Alabama; Dall, Burns, and Willcox.
Shell of moderate size, nearly equivalve, quite inequilateral, moderately convex; right valve with the disk nearly smooth, posterior margin produced; ears subequal, nearly smooth, their outer angles a little raised, so that the cardinal margins form a very obtuse angle at the beak ; byssal sinus represented by a marked flexure but not a distinct notch; left valve similar, slightly more convex, with about eighteen obsolete rounded ribs, separated by narrow, shallow grooves, sharpest near the beak, radiating nearly to the basal margin but becoming less visible there and at the submargins; ears vertically striated, subequal; interior of the disk with about twenty-one pairs of well-marked lirae similar in each valve; hinge with developed cross-striated cardinal crura, auricular crura present; margins of the valves smooth, not crenulated. Alt. of figured shell 35, lat. 35; alt. of largest specimen 43 mm. The fossils vary from nearly smooth to obviously ribbed; the byssal sinus is more distinct than in the other species and sometimes verges on a notch, and there is a perceptible byssal fasciole.» WILLIAM HEALEY DALL, 1898
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«DIMENSIONS.—Holotype, height 35 mm, width 35 mm, from Levy County Florida.
OCCURRENCE IN GEORGIA.— Common in Ocala Limestone at Muckafoonee Creek below dam near Albany (locality 26); reported from Ocala Limestone at Kinchafoonee Creek near Albany (Harris, 1951); rare in Ocala Limestone at abandoned quarry, Oakland Plantation near Albany (locality 25); rare in Ocala Limestone at Medusa Portland Cement Company quarry, Clinchfield (locality 29), and rare in Cooper Marl at Sugar Hill, 6 miles northeast of Unadilla (locality 30). DISTRIBUTION ELSEWHERE IN THE SOUTHEASTERN UNITED STATES.— Amusium ocalanum is common in the Upper Eocene of Florida (Ocala Limestone) and is rare to common in the Upper Eocene of Alabama (Shubuta Marl and Ocala Limestone).» GLAWE, L. N. 1974. Upper Eocene and Oligocene Pectinidae of Georgia and their stratigraphic significance. Geological Survey of Georgia, Information Circular, 46: 1-27, pls. 1-4. [p. 2]
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Amusium ocalanum Dall; L. N. Glawe, 1974, Upper Eocene and Oligocene Pectinidae of Georgia, plate 1, figures 1-6, 10.
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«The characteristics of the exterior of a left valve are well shown by McConnell's pen-and-ink drawing (op. cit., pl. 29, fig. 2). Figure 3, Plate 5 of the present report illustrates the characteristics of both sides of the shell. The lower part of the figure shows the exterior of a small portion of the shell, while above, the shell is scaled off exposing the imprint of the interior of the shell upon the inner mold. The twinning tendency of the interior ribbing is very noticeable.
Occurrence.— Shells of normal costation are common at Sta. 1170. Those showing no ribbing externally are common at Sta. 1175. This is a typical and abundant Ocala species.
Specimens of this species are not so large as the one (Pecten antiguensis) figured in number 7 of the Johns Hopkins University Studies in Geology (Waring and Harris, 1926, pl. 19, fig. 4).»
HARRIS, G. D. 1951. Preliminary notes on Ocala Bivalves. Bulletins of American Paleontology, 33 (138): 224 [5]-273 [55], pls. 30 [1]-42 [13]. (p. 229)
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Amusium ocalanum (Dall); G. D. Harris, 1951, Preliminary notes on Ocala Bivalves, plate 5 (34), figures 3-5.
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