Palynostratigraphy, Palynofacies, T-R Cycles and Paleoenvironments in the Middle Jurassic–Early Cretaceous Ramså Basin, Andøya, Northern Norway

Palynostratigraphy and palynofacies analyses are applied to identify transgressive-regressive sequences changes in paleoenvironment through the Middle Jurassic–Early Cretaceous succession of Ramså Basin on Andøya. The conglomerate, succeeding lacustrine-swamp deposits Hestberget Kullgrøfta members (Ramså Formation) overlying terrestrial marginal marine lower Bonteigen Member Formation), comprise Bajocian T-R sequence. Bathonian–Oxfordian strata appear be missing studied boreholes, second cycle spans Kimmeridgian Berriasian open upper Dragneset Formation (Breisanden, Taumhølet Ratjønna members). Nybrua comprises a condensed Valanginian–Early Barremian calcareous sandstone marl, followed by brownish-red siltstone. sequence (Skarstein consists transgressive dark siltstones, silty shales mudstones, mudstone shale. Marine palynomorphs recovered these stacked slope turbidite sediments Late age, but possibly youngest also includes Aptian elsewhere basin.