"Chlamys" cookei (Kellum, 1926)
KELLUM, L. B. 1926. Paleontology and stratigraphy of the Castle Hayne and Trent marls in North Carolina. United States Geological Survey Professional Paper, 143: 1-56, pls. 1-11. [p. 20, pl. 2, figs. 2, 3]
1926 Pecten cookei Kellum, 1926
L. B. Kellum, 1926, plate 2.
|
«Shell suborbicular, slightly oblique, moderately convex, and nearly equivalved, the left valve being more convex; 28 to 31 rounded ribs with equal interspaces; ribs crossed by concentric rows of imbrications, which toward the periphery and submargins tend to be produced into blunt spines; the inner spaces sculptured with extremely minute diagonal striations; anterior ears larger, right anterior ear sculptured with three strong ribs, which are crossed by numerous concentric rows, of coarse lamellae; posterior ears oblique, with less pronounced radiating ribs and concentric imbrications; byssalnotch approximately one-half the length of ear; ctenolium present; interior of valves grooved in accordance with external ribbing; the grooves becoming faint over medial portion of disk.
Dimensions of largest specimen: Height, 20.5 millimeters; breadth, 20 millimeters; depth of left valve, 4.5 millimeters. Pecten cookei is very similar to P. suwaneensis Dall, from the Ocala limestone of Suwannee County, Fla. It differs from P. suwaneensis in having the disk oblique, the ribs more numerous, with shallower interspaces, the ears shaped differently, and the grooves on the inner margin less angulated. P. cookei is named in honor of C. Wythe Cooke, geologist, of the United States Geological Survey. Localities: Northeast Cape Fear River and 3½ miles above Castle Hayne Bridge, Pender County; 2 miles south of Magnolia, 6 miles west of Pink Hill, and Northeast Cape Fear River near Chinquapin, Duplin County; near Broadhurst Bridge over Neuse River and Sarpony Hills, Wayne County; 2½ miles west of Dover and 2 miles northwest of Wilcox Bridge over Trent River, Jones County, N. C. Geologic horizon: Castle Hayne marl, of Jackson Eocene age.» LEWIS BURNETT KELLUM |