Меловой период

Hennebert M. (2014) The Cretaceous-Paleogene boundary and its 405-kyr eccentricity cycle phase: a new constraint on radiometric dating and astrochronology // Carnets de Géologie [Notebooks on Geology], Brest, vol. 14, nº 9, p. 173-189.

http://paleopolis.rediris.es/cg/1409/index.html