Mezdren Formation

The Mezdren Formation is a Late Cretaceous (Campanian) geologic formation located within Bisserna Cave, Shumen, Bulgaria.^[1]

Mezdren Formation
Stratigraphic range: Campanian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Eastern Fore-Balkan Zone
Underlies	Kaylaka Formation
Lithology
Primary	Limestone
Location
Coordinates	43.15°N 26.53°E / 43.15; 26.53
Region	Shumen Province
Country	Bulgaria
Extent	Bisserna Cave
Mezdren Formation (Bulgaria)