Foraminifers from the upper Oligocene, lower Miocene, and Pleistocene at Site 270 in the southern Ross Sea, Antarctica, are discussed and illustrated. The total fauna comprises 74 genera and 163 species. A small number of taxa are recycled from Cretaceous and older Paleogene sediments. Four assemblage zones are proposed, the age of informal lithologic units discussed, and potentially important ...

T of woodpeckers and allies (Pici) is very poor, but the members of this group—barbets and toucans (Ramphastidae including “Capitonidae”; see Prum 1988); honeyguides (Indicatoridae); and woodpeckers, wrynecks, and piculets (Picidae)—today have an almost worldwide distribution and occur in most forested habitats (del Hoyo et al. 2002). Paleogene (pre-Miocene; i.e. older than 23 Ma) remains of th...

Tarumania walkerae is a rare fossorial freshwater fish species from the lower Rio Negro, Central Amazonia, composing monotypic and recently described family Tarumaniidae. The has been proposed as sister group of Erythrinidae by both morphological molecular studies despite distinct arrangements superfamily Erythrinoidea within Characiformes. Recent phylogenomic time-calibrated analyses characoid...

The upper Paleocene to lower Eocene Margaret Formation exposed at Stenkul Fiord on southern Ellesmere Island, Nunavut, Canada, represents a nearly continuous terrestrial succession of microfossil-rich clastic sediments and coal. These strata were deposited time extensive tectonic activity associated with Eurekan deformation. precise chronology the deformation is poorly known. Prior studies prov...

The extensive Late Cretaceous - Early Paleogene sedimentary succession of Seymour Island, N.E. Antarctic Peninsula offers an unparalleled opportunity to examine the evolutionary origins of a modern polar marine fauna. Some 38 modern Southern Ocean molluscan genera (26 gastropods and 12 bivalves), representing approximately 18% of the total modern benthic molluscan fauna, can now be traced back ...

Silicon isotope ratios (expressed as δSi) in marine microfossils can provide insights into silica cycling over geologic time. Here we used δSi of sponge spicules and radiolarian tests from the Paleogene Equatorial Transect (Ocean Drilling Program Leg 199) spanning the Eocene and Oligocene (~50–23 Ma) to reconstruct dissolved silica (DSi) concentrations in deep waters and to examine upper ocean ...

[1] The accumulation of wind blown (eolian) dust in deep‐sea sediments reflects the aridity/humidity conditions of the continental region supplying the dust, as well as the “gustiness” of the climate system. Detailed studies of Pleistocene glacial‐interglacial dust fluxes suggest changes in accumulation rates corresponding to orbital variations in solar insolation (Milankovitch cycles). While t...