Меловой период

Grabowski J., Schnabl P., Lakova I., Sobień K., Petrova S. (2013) First magnetostratigraphic results of the Berriasian in the Western Balkan Mts, Bulgaria // Bulgarian Geological Society, National Conference with international participation “Geosciences 2013”. Pp. 69-70.
cretaceous.ru/pub/~/id/2304