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 .[ 1]
Most of the fossils found in the Kaylaka Formation were discovered in 1985, and were described in 2006;[ 1] the hadrosauroid specimen was not described until 2024.[ 4]
^ a b c d e f g h i j k 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. doi :10.2298/gabp0667051j . ISSN 0350-0608 .
^ Andreeva, Polina; Metodiev, Lubomir; Kiselinov, Hristo; Petrova, Silviya (2019-12-21). Campanian–Paleocene Carbonate Microfacies from the Sherbenski Dol Section (Eastern Fore-Balkan Mts, NE Bulgaria) – Preliminary Results (Report). "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences.
^ "Bisserna cave" . tecnet.cz . Retrieved 15 March 2024 .
^ a b 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" . Cretaceous Research . 157 (In press). 105819. Bibcode :2024CrRes.15705819N . doi :10.1016/j.cretres.2023.105819 . S2CID 266738171 .
^ "Hemipneustes striatoradiatus , Maastrichtian, Kaylaka Formation, Bulgaria" . Faopal Fossils . Retrieved 15 March 2024 .