Calcareous nannofossil evidence for the existence of the Gulf Stream during the late Maastrichtian
Article first published online: 16 AUG 2005
Copyright 2005 by the American Geophysical Union.
Volume 20, Issue 3, September 2005
How to Cite
2005), Calcareous nannofossil evidence for the existence of the Gulf Stream during the late Maastrichtian, Paleoceanography, 20, PA3006, doi:10.1029/2004PA001121., and (
- Issue published online: 16 AUG 2005
- Article first published online: 16 AUG 2005
- Manuscript Accepted: 25 APR 2005
- Manuscript Revised: 15 APR 2005
- Manuscript Received: 24 NOV 2004
 Upper Maastrichtian calcareous nannofossil assemblages, from eight cores on the South Carolina Coastal Plain (onshore set) and three deep sea drilling sites from the continental slope and abyssal hills (offshore set), were analyzed by correlation and principal component analysis to examine the ancient surface water thermal structure. In addition, a temperature index derived from independently published paleobiogeographic information was applied to the sample data. All three methods indicate a strong separation of the samples into onshore and offshore sets, with the offshore data set exhibiting significantly warmer paleotemperatures. The great disparity between these two sample sets indicates that there was a strong thermal contrast between the onshore and offshore surface water masses that persisted throughout the late Maastrichtian despite evident short-term changes in fertility, productivity, and community structure. This suggests the Gulf Stream was present as a major oceanographic feature during the late Maastrichtian.