نتایج جستجو برای: early miocene
تعداد نتایج: 690878 فیلتر نتایج به سال:
International Ocean Discovery Program (IODP) Expedition 359 cored sediments from eight borehole locations in the carbonate platform of the Maldives in the Indian Ocean. The expedition set out to unravel the timing of Neogene climate changes, in particular the evolution of the South Asian monsoon and fluctuations of the sea level. The timing of these changes are assessed by dating resultant sedi...
Fieldwork conducted since 1981 has greatly increased the sample of proboscidean fossils from Wadi Moghara, Egypt. The Moghara proboscidean assemblage is taxonomically more diverse than previously suspected, comprising four taxa: Gomphotherium angustidens libycum, Afrochoerodon kisumuensis, cf. Archaeobelodon, and Zygolophodon aegyptensis, sp. nov. Biochronological analysis of the proboscideans ...
Xuande Atoll is an isolated carbonate platform that has developed since the early Miocene. This study conducted high-resolution seismic surveys and shallow drilling to understand its internal structure development. Five sequences were observed (from bottom top): SQ1 (early Miocene), SQ2 (middle SQ3 (late SQ4 (Pliocene), SQ5 (Quaternary). The data indicated formation started in Miocene flourishe...
The phylogenetic position of the giant panda, Ailuropoda melanoleuca (Carnivora: Ursidae: Ailuropodinae), has been one of the most hotly debated topics by mammalian biologists and paleontologists during the last century. Based on molecular data, it is currently recognized as a true ursid, sister-taxon of the remaining extant bears, from which it would have diverged by the Early Miocene. However...
In general the geology of paleontological sites in Venezuela is poorly known. With the purpose of improving this knowledge we describe the geology of the Castillo Formation (Late Oligocene to Early Miocene) at Cerro La Cruz locality, in Lara state, Venezuela, that contains several records of vertebrate and invertebrate fauna. Lithologically, the Cerro La Cruz sequence is composed by alternating...
The Sungun copper porphyry deposit is hosted by a Tertiary magmatic complex in the Azarbayjan province , northwestern Iran. The Sungan mine in its southern and eastern parts is limited by early Miocene volcanic and by Late Cretaceous limestone rocks in northern and eastern parts respectively . The Sungun deposit is associated with a suite of porphyritic granitoids and late dikes intrudi...
New age data from Sr isotope analysis and both planktonic foraminifera and nannofossils are presented and discussed here for the Upper Eocene–Upper Miocene sedimentary rocks of the Değirmenlik (Kythrea) Group. New dating is also given of some Cretaceous and Pliocene sediments. In a revised stratigraphy the Değirmenlik (Kythrea) Group is divided into ten formations. Different Upper Miocene forma...
The palynological analysis in the Karpatian–Sarmatian (late Early-Middle Miocene) interval of the cores Tengelic-2 and Hidas53 (Hungary) reveals the existence of a forest organized in altitudinal belts, developed in a subtropical–warm temperate humid climate, reflecting the so-called Miocene climatic optimum. Pollen changes from the late early Miocene to the late middle Miocene have been observ...
Geological records from the Antarctic margin offer direct evidence of environmental variability at high southern latitudes and provide insight regarding ice sheet sensitivity to past climate change. The early to mid-Miocene (23-14 Mya) is a compelling interval to study as global temperatures and atmospheric CO2 concentrations were similar to those projected for coming centuries. Importantly, th...
—The subfamily Equinae in the Great Plains region of North America underwent a dramatic radiation and subsequent decline as climate changed from warm and humid in the middle Miocene to cooler and more arid conditions during the late Miocene. Here we use ecological niche modeling (ENM), specifically the GARP (Genetic Algorithm using Rule-set Prediction) modeling system, to reconstruct the geogra...
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