Меловой период

Zelenkov N., Averianov A., Popov E.V. (2017) An Ichthyornis-like bird from the earliest Late Cretaceous (Cenomanian) of European Russia // Cretaceous Research. Vol. 75. P.94-100. DOI: 10.1016/j.cretres.2017.03.011

https://www.researchgate.net/publicatio ... ean_Russia