| Country: | Spain   | 
| Province: | León, Gildar-Montó Region   | 
| Locality: | Horcada de Oro near Pico Gildar   | 
| Layer: | do II beta (upper Cheiloceras Stage) | 
| Lower Boundary: | UD2F--UD2G:(subvaricatum Zone base), 370.8 million years   | 
| Upper Boundary: | UD2H--UD2I:(mamilliferum base)   [12,90], 370 million years   | 
| Georeference: |  |