Kaylaka Formation Explained

Kaylaka Formation
Type:	Geological formation
Period:	Maastrichtian
Prilithology:	Limestone
Region:	Shumen Province and Vratsa Province
Coordinates:	43.15°N 26.53°W
Unitof:	Eastern Fore-Balkan Zone
Underlies:	Kamendel Formation
Overlies:	Mezdren Formation and Dobrina Formation
Extent:	Bisserna Cave and Labirinta Cave

The Kaylaka Formation,^[1] also known as the Kajlâka Formation, is a Late Cretaceous (Maastrichtian)^[2] geologic formation located within Bisserna Cave, Shumen,^[3] and Labirinta Cave, Vratsa Province, both in Bulgaria.

History

Most of the fossils found in the Kaylaka Formation were discovered in 1985, and were described in 2006; the hadrosauroid specimen was not described until 2024.

Paleofauna

• Anapachydiscus (Menuites) cf. terminus
• Anomotodon sp.
• Elasmosauridae? indet.
• Hadrosauroidea indet.^[4]
• Hemipneustes striatoradiatus^[5]
• Hoploscaphites constrictus
• Mosasauridae indet.
• Mosasaurus cf. hoffmanni
• Squalicorax pristodontus

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with few dinosaur genera

Notes and References

1. Jagt . John . Motchurova-Dekova . Neda . Ivanov . Plamen . Cappetta . Henri . Schulp . Anne . 2006 . Latest Cretaceous mosasaurs and lamniform sharks from Labirinta cave, Vratsa District (northwest Bulgaria): A preliminary note . Annales g?ologiques de la Peninsule balkanique . 67 . 51–63 . 10.2298/gabp0667051j . 0350-0608.
2. Campanian–Paleocene Carbonate Microfacies from the Sherbenski Dol Section (Eastern Fore-Balkan Mts, NE Bulgaria) – Preliminary Results . Andreeva . Polina . Metodiev . Lubomir . 2019-12-21 . "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences . Kiselinov . Hristo . Petrova . Silviya.
3. Web site: Bisserna cave . 15 March 2024 . tecnet.cz.
4. Nikolov . Vladimir . Dochev . Docho . Brusatte . Stephen L. . 2024-01-01 . The ontogenetic status of a small hadrosauroid dinosaur from the uppermost Cretaceous of Bulgaria, and implications for the paleobiogeography and assembly of European island faunas . . en . 157 . In press . 105819 . 2024CrRes.15705819N . 10.1016/j.cretres.2023.105819 . 266738171.
5. Web site: Hemipneustes striatoradiatus, Maastrichtian, Kaylaka Formation, Bulgaria . 15 March 2024 . Faopal Fossils.