Меловой период

Dochev D. (2015) Turonian (Upper Cretaceous) inoceramid bivalves of the genus Mytiloides from the Sredna Gora Mountains, north-western Bulgaria // Acta Geologica Polonica, Vol.65. no.1. P.101–119.

https://geojournals.pgi.gov.pl/agp/arti ... 993/pdf_28