Cenomanian to Turonian
Texas to Oregon
Original presentation: Ammonites navicularis
Original publication. Mantell. 1822. [p. 198, pl. 22, fig. 5].
Holotype: see Cobban (1971).
Type locality: England (Cobban, 1971).
Type horizon: upper Chalk (Cobban, 1971).
References: Cobban (1971).
- Greenhorn Limestone (Bridge Creek Member) (CO)
- Britton Formation (TX)
- Colorado Formation (NM)
- Colorado Formation (Bridge Creek Limestone Member) (NM)
- Greenhorn Limestone (KS)
- Greenhorn Limestone (Bridge Creek Limestone Member) (KS)
- Unknown Stage
- Hornbrook Formation (OR)