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Application of simple arithmetic ratios to study of DSDP Black Sea cores

Steppe/forest ("SFI") and marine influence ("MI") curves have been used in study of DSDP Black Sea cores to demonstrate the occurrence of palaeoclimatic and palaeosedimentological events in the Black Sea basin. "SFI" is calculated as a modified ratio of certain herb and shrub pollen to tree pollen, "MI" as a modified ratio of dinoflagellates and acritarchs to pollen. One peculiar dinoflagellate type ("dinoflagellates 19-20") turns out to be a fresh-water dinoflagellate, and its counts must therefore be excluded from "corrected MI". Cyclical deposition of thin Seek-reide layers in the Black Sea is often related to high dinoflagellate 19-20 counts and usually to high "SFI" (indicating dry-cold climate), but not in any consistent way to corrected "MI".