نتایج جستجو برای: neoproterozoic
تعداد نتایج: 1175 فیلتر نتایج به سال:
The cycles of carbon and oxygen at the Earth surface are intimately linked, where the burial of organic carbon into sediments represents a source of oxygen to the surface environment. This coupling is typically quantified through the isotope records of organic and inorganic carbon. Yet, the late Neoproterozoic Eon, the time when animals first evolved, experienced wild isotope fluctuations which...
Symbiosis represents close and long-term interactions—which can be mutualistic, commensalistic, or parasitic—between two different taxa. Symbiotic associations play a pivotal role in accelerating eukaryotic evolution diversification. However, the Proterozoic fossil record of symbiosis is rarely documented despite abundance eukaryotes their accelerated diversification Neoproterozoic. The scarcit...
Metapelites of the Do Chah complex (SE Shahrood) are composed of micaschist, garnet micaschist, chloritoid schist and garnet-bearing gneiss. In the highest degree of metamorphism, metapelites have been affected by partial melting, resulting as granitization. A significant part of these rocks, imposed by compressional tectonic regime and show typical evidence of plastic deformation and intensive...
We hypothesize that a demographic and ecological effect of Neoproterozoic ‘snowball Earth’ glaciations was to increase the fitness of group-level traits and consequently the likelihood of the evolution of macroscopic form. Extreme and repeated founder effects raised genetic relatedness – and therefore the influence of kin selection on the individuals within a group. This was permissive for the ...
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