Baffin Bay late Neogene palynostratigraphy at Ocean Drilling Program Site 645

Analyses of marine and terrestrial palynomorphs Ocean Drilling Program (ODP) Site 645 in Baffin Bay led us to define a new biostratigraphical scheme covering the late Miocene Pleistocene based on dinocyst acritarch assemblages. Four biozones were defined. The first one, from 438.6 m below sea floor (mbsf) 388 mbsf, can be assigned early Pliocene age (>4.5 Ma), common occurrence Cristadinium diminutivum Selenopemphix brevispinosa. Biozone 2, spanning an erosional unconformity recovery hiatus, is marked by highest occurrences (HOs) Veriplicidium franklinii diminutivum, which suggest >3.6 Ma (∼4.5 ∼3.6 Ma). 3, above hiatus up 220.94 corresponds or Bitectatodinium readwaldii, Cymatiosphaera? icenorum, Lavradosphaera canalis. Finally, between 266.4 120.56 4, HO Filisphaera filifera, microornata, Habibacysta tectata, has (>1.4 Our biostratigraphy implies that horizon b1 seismic stratigraphy at ODP 645, suggests very thick sequence along Island slope. Dinocyst assemblages our records indicate (or) characterized relatively warm coastal surface waters boreal forest forested tundra vegetation over adjacent lands. In contrast, cold waters, while pollen data reduced cover