Currently, marsupials (modern members of the Metatheria clade) are widely distributed in tropical and subtropical areas South America, but poorly represented fossil record these regions. Except for species-rich fossiliferous localities La Venta Colombia, additional Miocene metatherians from tropical, equatorial America sparsely reported Bolivia, Brazil, Peru, Venezuela. Here, we introduce new m...

We present a new and innovative way of determining the oxygen level of Earth’s past atmosphere by directly measuring inclusion gases trapped in halite. After intensive screening using multiple depositional, textural/fabric, and geochemical parameters, we determined that tectonically undisturbed cumulate, chevron, and cornet halite inclusions may retain atmospheric gas during crystallization fro...

The Neoproterozoic contains severe glacial intervals (750–580 Ma) including two extending to low palaeomagnetic latitudes. Paucity of radiometric dates indicates the need for chronostratigraphic tools. Whereas the marine Sr/Sr signatures show a steady rise, C fluctuates, the most reproducible variations being negative signatures in carbonate caps to glacial units, but more diagenetic work is ne...

To constrain the paleo - positions of South China Cratons in Rodinia Supercontinent during Neoproterozoic, situ U Pb dating, and Hf isotope analysis detrital zircon from Nam Co Complex, Song Ma Suture zone, northwestern Vietnam was performed. The isotopic dating on zircons shows that Complex demonstrates major population (>50%) around ~850 while minor is scattered between ~1.2÷3.0 Ga. Neopro...

U/Pb ages of detrital zircon from two samples Ordovician sediments were determined and, based on similar published data, compared with xenocrystal inheritance Triassic and Oligocene granitoids the Cordillera Real in order to better understand their genetic relationship sources. The results show that sandstone inherited cores are statistically correlated. This correlation suggests assimilation t...

Geochemical, isotopic and age constraints support a comagmatic origin for Ghuweir Mafics and the Feinan A-type granites. The two rocks types, named collectively in this paper as the Feinan Ghuweir Magmatic Suite (FGMS), formed between 556 and 572Ma ago according to Rb–Sr whole-rock dating. FGMS has low Sr initial ratios, which preclude a significant contribution of much older crust in the magma...

Tintinnids are very common in all marine water and even fresh water. The oldest fossils of Tintinnids are not only appeared in Neoproterozoic Era, but also in Mesoproterozoic Calymmian. Eight species of six genera Tintinnids of Mesoproterozoic Calymmian, from Huangmailing Phosphoric Ore in Hubei Province of Central China, are illustrated in this paper. They are the oldest ancestor of Tintinnids...