The Eocene continental sequence investigated in this study belongs to the Salta Group; it was deposited an intracontinental rift, Basin (NW Argentina) that evolved from Lower Cretaceous middle Paleogene. Group contains Maíz Gordo and Lumbrera Fms, spans Paleocene-early Eocene, shows excellent exposures region of Valles Calchaquíes. This research is focused on facies Fm, which correspond early E...

The Grande Coupure corresponds to a major episode of faunal turnover in western Europe around the Eocene-Oligocene boundary that is generally attributed influx multiple clades Asian mammals. However, mammal begin appear fossil record southeastern during middle Eocene, 5–10 million years prior Coupure. How and when these colonized remains poorly understood, partly because mammals from nearby Ana...

Dramatic early Cenozoic climatic shifts resulted in faunal reorganization on a global scale. Among vertebrates, multiple groups of mammals (e.g., adapiform and omomyiform primates, mesonychids, taeniodonts, dichobunid artiodactyls) are well known from the Western Interior North America warm, greenhouse conditions Eocene, but dramatic drop diversity these groups, along with introduction more dry...

—Mass extinctions can play a role in shaping macroevolutionary trends through time, but the contribution of recoveries to this process has yet to be examined in detail. This study focuses on the effects of three extinction events, the end-Cretaceous (K/T), mid-Eocene (mid-E), and endEocene (E/O), on long-term patterns of body size in veneroid bivalves. Systematic data were collected for 719 spe...

At Ocean Drilling Program (ODP) Site 1090 (lat 42 54.8 S, long 8 54.0 E) located in a water depth of 3702 m on the Agulhas Ridge in the sub-Antarctic South Atlantic, 300 m of middle Eocene to middle Miocene sediments were recovered with the advanced piston corer (APC) and the extended core barrel (XCB). U-channel samples from the 70–230 meters composite depth (mcd) interval provide a magnetic p...

Abstract Besides nitrate deposits located in the Atacama Desert of Chile and Mojave California, present work documents, for first time, occurrence potassium as oval-suboval-shaped aggregations associated with Late Maastrichtian-Early Paleocene Dakhla Shale Paleocene-Early Eocene Esna encountered northeastern part Kharga Oasis, particularly at G. Um El-Ghanayem Ghaneima. Consequently, integrated...

The symbiont-bearing mixed-layer planktic foraminiferal genera Morozovella and Acarinina were among the most important calcifiers of early Paleogene tropical-subtropical oceans. A marked and permanent switch in the abundance of these genera is known to have occurred at low-latitude sites at the beginning of the Early Eocene Climatic Optimum (EECO), such that the relative abundance of Morozovell...

Kangaroos and kin (Macropodiformes) are themost conspicuous elements of the Australasianmarsupial fauna. The approximately 70 living species can be divided into three families: (1) Hypsiprymnodontidae (themusky rat kangaroo); (2) Potoroidae (potoroos and bettongs); and (3) Macropodidae (larger kangaroos, wallabies, banded hare wallaby and pademelons). Here we examine macropodiform relationships...