Rovearinids (stemless crinoids) in the Albian carbonates of the offshore Santos Basin, southeastern Brazil: stratigraphic, palaeobiogeographic and palaeoceanographic significance

摘要: Abstract Microfacies analysis of marine carbonates cored by Petrobras well 1-SPS-6 in the offshore Santos Basin (southeastern Brazil) has revealed a remarkable fossil assemblage calpionellids (colomiellids), favusellids, hedbergellids, globigerinelloidids, buliminids, radiolarians, inoceramid prisms, roveacrinids, and saccocomids(?) preserved lower Albian calcimudstones–wackestones part Guaruja Formation. This represents an allochtonous accumulation deep neritic to shallow bathyal hypoxic environment. Besides ‘saccocomid-like’ sections, only determinable sections roveacrinids are thecal plates Poecilocrinus dispandus elongatus Peck, 1943. species was previously known from Weno Formation Texas. The Brazilian material extends its records farther south at least Albian, which then earliest occurrence this peculiar family South Atlantic region. Taking into account their global distribution location oldest representative (Hauterivian near Alicante, Spain), Roveacrinidae dispersed westward throughout all Cretaceous Tethys. Tethyan origin is further evidence that, during late Aptian–Albian times, northern (north Walvis–Sao Paulo Ridge) supplied water mass.