Меловой период

Pauly S. (2012) Stratigraphy and palaeogeography of the Boreal Lower Cretaceous – evidences from calcareous nannofossils and geochemistry. Diss. Dokt. Naturwiss. Rugr-Universitaet Bochum. 155 pp.

http://www-brs.ub.ruhr-uni-bochum.de/ne ... n/diss.pdf