Меловой период

Nguyen, A. V. (2019) Upper Jurassic-Lower Cretaceous palynostratigraphy of the Aklavik Range, Northwest Territories, Arctic Canada. Master Thesis, University of Calgary. 298 pp.
https://prism.ucalgary.ca/bitstream/han ... sAllowed=y
https://prism.ucalgary.ca/handle/1880/110242