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Evidence of changes in surface water temperature and productivity at the Cenomanian/Turonian Boundary

¹ ExxonMobil Exploration Company, 222 Benmar, GP8, #555 Houston, TX 77060, email: jason.w.eleson{at}exxonmobil.com
² Department of Geosciences, Pennsylvania State University, University Park, PA 16802, email: bralower{at}geosc.psu.edu

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.