| Calizas de Lychnus Formation | |
|---|---|
| Stratigraphic range: Maastrichtian | |
| Type | Geological formation | 
| Lithology | |
| Primary | Limestone | 
| Other | Mudstone | 
| Location | |
| Coordinates | 41°54′N3°24′W / 41.9°N 3.4°W | 
| Approximate paleocoordinates | 34°06′N3°00′W / 34.1°N 3.0°W | 
| Region | Castille and Leon | 
| Country | Spain | 
The Calizas de Lychnus Formation is a Maastrichtian geologic formation in northern central Spain. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation. [1]