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| Country | : | Mexico |
| Region | : | Coahuila |
| Outcrop | : | Sierra de Tlahualilo, loc. 18, 8150 feet N 72,15' E of Ojo de Agua |
| References | : | PERKINS 1960 |
| Stratigraphy | : | Albian up - Cenomanian low |
| Lithostratigraphy | : | Aurora Limestone |