نتایج جستجو برای: lower miocene
تعداد نتایج: 697574 فیلتر نتایج به سال:
Studies in Neotropical Paleobotany. V. The Lower Miocene Communities of Panama-The Culebra Formation
The timing history and driving mechanisms of C4 expansion and Tibetan uplift are hotly debated issues. Paleoenvironmental evidence from within the Tibetan Plateau is essential to help resolve these issues. Here we report results of stable C and O isotope analyses of tooth enamel samples from a variety of late Cenozoic mammals, including deer, giraffe, horse, rhino, and elephant, from the Qaidam...
There is a considerable controversy about whether western Amazonia was ever covered by marine waters during the Miocene [23 to 5 Ma (million years ago)]. We investigated the possible occurrence of Miocene marine incursions in the Llanos and Amazonas/Solimões basins, using sedimentological and palynological data from two sediment cores taken in eastern Colombia and northwestern Brazil together w...
The the Middle Cretaceous-Lower Miocene petroleum system of the Kupal oil field, located in the Dezful Embayment has been studied. The Kazhdumi and Pabdeh are main source rocks, the Sarvak, Ilam and Asmari formations are reservoir and the Gachsaran formation is the seal rock. According to geochemical analysis the Kazhdumi and Pabdeh contributed to oil production and feeding the Asmari and Bange...
Bois fossiles du Miocène inférieur Myanmar (formation de Natma): implications paléoenvironnementales et biogéographiques. Le registre botanique fossile (Birmanie) est faiblement documenté malgré son importance pour comprendre l'évolution des écosystèmes mousson au cours temps géologiques. Nous décrivons ici 20 taxa bois issus 30 specimens silicifiés la Formation Natma (Myanmar central) datant t...
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