- journal_title：Micropaleontology
- Contributor：Jason W. Eleson ; Timothy J. Bralower
- Publisher：Micropaleontology Project
- Date：2005-
- Format：text/html
- Language：en
- Identifier：10.2113/gsmicropal.51.4.319
- journal_abbrev：Micropaleontology
- issn：0026-2803
- volume：51
- issue：4
- firstpage：319
- section：Articles
Calcareous nannofossil assemblages were investigated across the Oceanic Anoxic Event (OAE) at the Cenomanian/Turonian Boundary (CTB) in a section from the Western Interior Basin and a borehole from the New Jersey coastal plain. The objective was to determine the surface-water response to environmental perturbations during the OAE. A decrease in surface water fertility at the two localities is suggested by an increase in relative abundances of taxa with oligotrophic affinities and a concomitant decrease in taxa with mesotrophic or eutrophic affinities. Oligotrophy and anoxia at both localities are likely responses to increased water-column stratification associated with the incursion of warmer waters from lower latitudes.