Cenomanian
Texas
Original presentation: Acanthoceras lonsdalei
Original publication: Adkins. 1928. [p. 244, pl. 26, fig. 5, pl. 27, fig. 3].
Holotype: TMM 2410.
Type locality: Belton-Temple Road, Bell County, Texas (Kennedy and Cobban, 1990).
Type horizon: “Bluebonnet Member of the Lake Waco Formation of the Eagle Ford Group” (Kennedy and Cobban, 1990a, p. 121).
Other specimens: USNM 108831a-b, USNM 420268-420272, TMM 1069, WSA 12830.
Zonation: Acanthoceras bellense zone = Middle Cenomanian (Cobban et al., 2006).
Other occurrences: “Middle Cenomanian of Bathurst Island, northern Australia” (Kennedy and Cobban, 1990a, p. 122).
References: Kennedy and Cobban (1990a).