Paleoclimatic reconstruction the brazilian cretaceous based on palynological data

Vegetational composition of the Early Cretaceous Chicalhão flora (Lusitanian Basin, western Portugal) based on palynological and mesofossil assemblages

Paleoclimatic reconstruction using Mutual Climatic Range on terrestrial mollusks

Terrestrial mollusks, easily identified in Quaternary sediments, represent a reliable tool for quantitative estimates of environmental parameters. Our study, comparing the species distribution with meteorological parameters in Europe, shows that mean temperature of the coldest month and annual thermal magnitude are the most important forcing parameters. This survey allows us to adapt the Mutual...

Reconstruction of past environmental conditions predominated on Daranjir playa based on analysis of nebkhas sediment data

  Introduction Research on ancient and recent global environmental change has mainly been based on natural records, such as those preserved in ice cores, loess deposits, tree rings, corals, stalagmites, and deep-sea and lake sediments (Li et al, 2014). These records have been used to reconstruct the Earth’s past climate, environment, and ecological history (Zhou, 2006). However, in the arid an...

the role of task-based techniques on the acquisition of english language structures by the intermediate efl students

this study examines the effetivenss of task-based activities in helping students learn english language structures for a better communication. initially, a michigan test was administered to the two groups of 52 students majoring in english at the allameh ghotb -e- ravandi university to ensure their homogeneity. the students scores on the grammar part of this test were also regarded as their pre...

NMR Analysis of Brazilian Cretaceous Ambers

Espectros de ressonância magnética nuclear de C com polarização cruzada e rotação no ângulo mágico (RMN-CPMAS de C) foram obtidos pela primeira vez para três amostras de âmbar provenientes do Mesozóico da América do Sul. As amostras foram datadas como pertencentes ao Cretáceo Inferior e coletadas em sedimentos das bacias do Amazonas, Araripe e Recôncavo, Brasil. Todas as amostras apresentaram e...