North American mammals experienced a major mass extinction at the Cretaceous/Tertiary (K/T) boundary that is tied unambiguously to the Chicxulub impact event. Immediately afterwards, there was an immense adaptive radiation that greatly expanded taxonomic diversity and the range of body sizes and ecological strategies. However, ties between later, Cenozoic impact events and specific episodes in ...

The origin and processes creating the high diversity of plant species in neotropical rain forests and their floristic composition and multistratitified forest structure are still uncertain. Here, we studied one of the most common leaf morphotypes of the Cerrejón flora (middle-late Paleocene, ca. 60-58 Ma), Guajira, Colombia, that contains one of the oldest records of neotropical rain forest flo...

[1] Satellite gravity inversion incorporating a lithosphere thermal gravity correction has been used to map crustal thickness and lithosphere thinning factor for the NE Atlantic. Predicted oceanic crustal thicknesses in the Norwegian Basin are between 4 and 7 km on the extinct Aegir Ridge, increasing to 9 – 14 km at the margins, consistent with volcanic margin continental breakup at the end of ...

Des dépôts offshores localisés à l’Est de la marge d’Abidjan (Côte d’Ivoire) ont fait l’objet d’analyse palynologique et palynofaciologique. Elle a porté sur des déblais forage partir desquels trente-deux (32) paires lames minces palynologiques été confectionnées. L’objectif était mettre en évidence les étages du Tertiaire limite K-Pg par palynomorphes stratigraphiques déterminer environnements...

Thick sandstones of the Yamna suite are widespread throughout Skіba cover, as well in south-eastern part Krosno cover. The research area is bounded by Limnytsia River northwest and Ukrainian-Romanian border southeast. Several promising structures comprising (Brusturanska, Yanovetska, Voronenkivska) identified this area. Among them, according to number positive indicators oil gas potential, Voro...

Tubes of a new serpulid species, Neovermilia gundstrupensis sp. nov., from the lower part Kerteminde Marl Formation (Selandian, middle Paleocene) Gundstrup gravel pit, Fyn, Denmark, represent first serpulids this group Selandian Denmark. Within long-ranging genus (Oxfordian to Recent), finds extend last recorded occurrence an informal sub-group closely related upper Danian Selandian. is charact...

The Paleocene/Eocene thermal maximum (PETM) and associated carbon isotope excursion (CIE) are often touted as the best geologic analog for the current anthropogenic rise in pCO2. However, a causal mechanism for the PETM CIE remains unidentified because of large uncertainties in the duration of the CIE's onset. Here, we report on a sequence of rhythmic sedimentary couplets comprising the Paleoce...

This monograph has been compiled by members of the Paleogene Planktonic Foraminifera Working Group (hereafter referred to as the Working Group) of the International Subcommission on Paleogene Stratigraphy, International Union of Geological Sciences. It is the second such work in a projected series of three, the first being the Atlas of Paleocene Planktonic Foraminifera published by Smithsonian ...

Attine ants cultivate fungi as their most important food source and in turn the fungus is nourished, protected against harmful microorganisms, and dispersed by the ants. This symbiosis evolved approximately 50-60 million years ago in the late Paleocene or early Eocene, and since its origin attine ants have acquired a variety of fungal mutualists in the Leucocoprineae and the distantly related P...