Early Cenozoic Calcareous Nannoplankton Biogeography of the Atlantic Ocean.

摘要

Biogeographic patterns of Early Cenozoic calcareous nannoplankton assemblages are delineated for the North and South Atlantic, Caribbean, and Gulf of Mexico. Nannoplankton assemblages are defined by Q-mode Varimax Factor and Oblique Factor Analyses of census data on 44 taxa from 113 deep-sea and land-based samples. Examination of their latitudinal distribution through time allows recognition of those assemblages which can be used as environmental indicators. Comparison of the distributions of contemporaneous nannoplankton assemblages with the distribution of the appropriate environmental indicator assemblage permits their classification as either low, mid, or high latitude nannoflora.