Foraminiferal assemblages in sediments from Hole 543A suggest that toward the end of the Cretaceous there was an oscillating carbonate compensation depth (CCD) in the western Central Atlantic. Changing assemblages of siliceous agglutinated and calcareous foraminifers reflect the changing depositional environment, from a ridge crest environment during Campanian time to a deep abyssal environment during Maestrichtian time.
Supplement to: Hemleben, Christoph; Troester, Joachim (1984): Campanian-Maestrichtian deep-water foraminifers from Hole 543A, Deep Sea Drilling Project. In: Biju-Duval, B; Moore, JC; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 78A, 509-532, doi:10.2973/dsdp.proc.78a.126.1984