Меловой период

Linnert C., Robinson S.A., Lees J.A., Bown P.R., Pérez-Rodríguez I., Petrizzo M.R., Falzoni F., Littler K., Arz J.A., Russell E.E. (2014) Evidence for global cooling in the Late Cretaceous // Nature Commun. Jun 17;5:4194. doi: 10.1038/ncomms5194.
http://www.nature.com/ncomms/2014/14061 ... ms5194.pdf