Alaskan Cretaceous-Tertiary floras and Arctic origins

By: , and 



Cretaceous floras in Alaska, when compared to those at mid-latitudes, generally indicate later appearances in Alaska of major clades and major leaf morphologies. Compared to mid-latitude florasAlaskan Late Cretaceous floras contain few major clades. The Alaskan clades diversified but at a low taxonomic level. Migrational pathways into high latitudes were probably along streams. Similar patterns characterized the Alaskan Tertiary, although some southward migrations of lineages occurred during the Neogene. Review of other Arctic paleontological data from Ellesmere Island, previously used to suggest that the Arctic was a major center of origin during the Late Cretaceous, indicates that the ages of supposedly substantiating dinoflagellate floras were misinterpreted. When the dinoflagellate data are interpreted according to standard methodology, first occurrences of genera and species groups on Ellesmere are, like the Alaskan occurrences, later than first occurrences at middle latitudes. 

Publication type Article
Publication Subtype Journal Article
Title Alaskan Cretaceous-Tertiary floras and Arctic origins
Series title Paleobiology
DOI 10.1017/S0094837300008599
Volume 13
Issue 1
Year Published 1987
Language English
Publisher Cambridge University Press
Description 11 p.
First page 73
Last page 83
Google Analytic Metrics Metrics page
Additional publication details