FIGURE 4. Texanites lonsdalei Young, 1963 from the Tepeyac section. A in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico

FIGURE 4. Texanites lonsdalei Young, 1963 from the Tepeyac section. A: in bed TPY11; B: IGM 12796, bed TPY 21 C–D: IGM 12797, bed TPY 14; E–G: CPC–2377, bed TPY33. Scale: 50 mm.