biostratigraphic correlation – microfossil pic Published 05/02/2012 at 400 × 460 in biostratigraphic correlation – microfossil pic Clockwise from top left: ostracode, planktic foraminifer, diatom, benthic foraminifer, and pollen grain. Clockwise from top left: ostracode, planktic foraminifer, diatom, benthic foraminifer, and pollen grain.