Eubaculites sp.

KENNEDY, W. J., LANDMAN, N. H., COBBAN, W. A. & JOHNSON, R. O., 2000, Additions to the Ammonite Fauna of the Upper Cretaceous Navesink Formation of New Jersey, American Museum Novitates 3306, pp. 1-31 : 18

Eubaculites sp. ?

Figure 8I–T

DESCRIPTION: MAPS A2057 a 1 , 2 (fig. 8I– P) are two septate internal molds 41.0 and 43.5 mm long with taper angles of 4 and 6° and maximum whorl heights of 16.0 and 17.0 mm, respectively. The whorl section is oval with a narrow venter. The flanks are broadly rounded and the dorsum is well rounded. The flanks are ornamented by low, broad crescentic ribs, with a rib index of 3. No ribs are present on the venter. MAPS A2057 a 3 (fig. 8Q– T) is a very large septate fragment 79 mm long. It has a maximum whorl height and breadth of 35.7 mm and 25.7 mm, respectively. Like the smaller specimens, it has an oval whorl section with a broad dorsum and narrow venter. There are five broad crescentic ribs on the flanks, with a rib index of 3. The suture in all three specimens is fairly simple .

DISCUSSION: These specimens resemble Eubaculites carinatus (Morton, 1834) in their oval whorl section with narrow venter, flank ornament, and suture. They differ, however, in lacking a clearly defined tabulate venter. In addition, the large specimen is unusually large for this species.

OCCURRENCE: Basal part of the Navesink Formation in a tributary on the west side of Crosswicks Creek , south of Allentown , Monmouth County, New Jersey. The specimens are associated with a large collection of Baculites ovatus Say, 1820 .

SUPERFAMILY SCAPHITACEAE GILL, 1871

FAMILY SCAPHITIDAE GILL, 1871

SUBFAMILY SCAPHITINAE GILL, 1871