نتایج جستجو برای: oligocene
تعداد نتایج: 2183 فیلتر نتایج به سال:
A new emu (Emuarius guljaruba, sp. nov.) is described from the Late Oligocene Etadunna Formation (Ngama Local Fauna), based on a complete tarsometatarsus. While exhibiting evidence of cursorial abilities advanced over those of cassowaries (Casuarius), this taxon was not as cursorially adapted as the living Emu (Dromaius novaehollandiae). This taxon is provisionally referred to the genus Emuariu...
Global-scale data on the Oligocene to Recent planktic foraminifers and coccoliths from the tropical Pacific and Atlantic Oceans are employed for quantitative testing of alternative models (Red Queen and Stationary Hypotheses) of the relationship between speciation rates, extinction rates, taxonomic diversity, abiotic events, and history of the paleosystem. The results demonstrate that although ...
During Leg 59 of the Deep Sea Drilling Project, five sites (447 to 451) were occupied and seven holes drilled between Okinawa and Guam in the Philippine Sea (Fig. 1). All holes except Hole 447 yielded common calcareous nannoplankton at certain intervals cored. Nannoplankton assemblages and their age assignments will be discussed for each site, and fossil lists for selected samples from Holes 44...
Two new fossil taxa of the ash tree, namely F. zlatkoi Meng-Xiao Wu et J.Huang sp. nov. and Fraxinus cf. honshuensis Tanai Onoe were reported from early Oligocene Lühe flora, Yunnan Province, Southwest China. The fruit traits used to assign proposed species genus Fraxinus. These a flattened symmetrical shape, single seed located in base veins parallel long axis each fruit. have low length width...
During the late Oligocene to early Miocene residual Magura Basin was located along front of Pieniny Klippen Belt (PKB). This basin supplied with clastic material derived from a south-eastern direction. In Male (Little) Mts. in Poland, Oligocene/ Kremna Fm. Nappe (Krynica subunit) occurs both PKB as well tectonic windows within PKB. Lenses exotic conglomerates contain frequent clasts Mesozoic li...
In SW Piemonte the Western Alps arc ends off in a narrow, E-W trending zone, where some geological domains of converged. Based on critical review available data, integrated with new field it is concluded that southern termination recorded Oligocene-Miocene activity regional transfer zone (southwestern Transfer, SWAT) already postulated literature, which should have allowed, since early Oligocen...
Since the acceptance of plate tectonics, presence calc-alkaline magmatic rocks has been recognized as evidence subduction. But under specific geodynamic circumstances, subduction may occur without generating magmas. Here, we investigate Cenozoic northern Lesser Antilles arc where, from sparsely exposed records, Eocene?Oligocene and Pliocene flare-ups a Miocene lull were postulated. Nevertheless...
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