| Group or Formation
|
Period
|
Notes
|
| Babino Formation |
Triassic |
|
| Bilka Formation |
Jurassic |
|
| Cerkoviste Formation |
Jurassic |
|
| Djula Formation |
Jurassic |
|
| Kajlâka Formation |
Cretaceous |
|
| Karavelyovo Formation |
Jurassic |
|
| Lovech Urgonian Group/Balgarene Formation |
Cretaceous |
|
| Lovech Urgonian Group/Emen Formation |
Cretaceous |
|
| Lovech Urgonian Group/Smochan Formation |
Cretaceous |
|
| Milanovo Formation |
Triassic |
|
| Ozirovo Formation |
Jurassic |
|
| Polaten Formation |
Jurassic |
|
| Radomir Formation |
Triassic |
|
| Sanadinovo Formation |
Cretaceous |
|
| Slivnitsa Formation |
Cretaceous, Jurassic |
|
| Sokolovskaya Series Formation |
Jurassic |
|
