نتایج جستجو برای: early cambrian schists
تعداد نتایج: 688211 فیلتر نتایج به سال:
Sixty-four surface samples from the Lower Palaeozoic rock units (mainly Lalun,Abastu and Abarsaj formations) near Kholin-Darreh village in the Fazel Abad area,southeastern the Caspian Sea, Northern Iran, were analyzed to determine their agerelationships. The samples of Lalun Formation were barren, but those of Abastu andAbarsaj formations contained well-preserved and abundant palynomorph entiti...
Sessile epibenthos were diverse and played important part in the process of energy flow Cambrian marine ecosystem. Based on new specimens from Gaoloufang Section Wulongqing Formation, we describe two representatives group that show character traits with cnidarians bryozoans. If confirmed, material can help us understand origin early evolution these phyla. The discovery more sessile suggests ben...
petrography, modal analysis of sandstones and major elements geochemistry of shales of early cambrian zagun formation in sarbandan section, central alborz, are used to identify their provenance (including parent rocks, tectonic setting and paleo-weathering). petrography of the sandstones and plotting their point counting data on qt44, f47, l9 and qm44, f45 ,lt11 diagrams imply that they are ark...
Establishing the timescale of early land plant evolution is essential for testing hypotheses on the coevolution of land plants and Earth's System. The sparseness of early land plant megafossils and stratigraphic controls on their distribution make the fossil record an unreliable guide, leaving only the molecular clock. However, the application of molecular clock methodology is challenged by the...
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