نتایج جستجو برای: upper cambrian

تعداد نتایج: 207398  

Journal: :Journal of Asian Earth Sciences 2021

The existence of late Cambrian (Furongian) trilobites in Myanmar (Burma) has been acknowledged since the 1970s, but no formal systematic descriptions such fossils have published to date. Herein, we provide some from Molohein Group’s Myet-Ye Formation Linwe area, Ye-Ngan Township southern Shan State. Three species two genera are reported: Asioptychaspis (A. asiatica, previously known North China...

Journal: :Basin Research 2021

The Upper Ediacaran to Lower Cambrian of the Sichuan Basin in South China has long been considered be dominated by shallow-water deposition. Hydrocarbon exploration, however, revealed that a NW-SE trending intraplatform trough formed basin during same period. Although different models have proposed, formation and evolution are still not fully understood. In this study, we investigate both origi...

Journal: :Geologica Balcanica 2023

The Central Balkan Zone belongs to the north-vergent fold-and-thrust belt of Alpine orogen. In this zone, pre-Permian low-grade rocks, metamorphosed during Variscan orogeny, were later reworked at two main stages compressional tectonics. Several tectono-stratigraphic subdivisions these metamorphic rocks previously presented, based on a purely stratigraphic approach in absence detailed structura...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده ادبیات و علوم انسانی 1390

abstract the variables affecting the nature of reading comprehension can be classified into two general categories: reader’s variables, and text variables (alderson, 2000). despite the wave of research on vocabulary knowledge as reader’s variable, the role of this knowledge in c-test as a text-dependent test and its interaction with lexical cohesion of the test as a text feature has remained a...

2008
Jonathan R. Hendricks Bruce S. Lieberman Alycia L. Stigall

Article history: Soft-bodied Cambrian arth Received 15 August 2007 Received in revised form 27 March 2008 Accepted 3 April 2008

Journal: :Current Biology 2002
Simon Conway Morris

The Precambrian genesis plus Cambrian explosion scenario also implies a perplexing view of a major evolutionary radiation: a long period of cryptic speciation with increasing developmental complexity and anatomical sophistication, yet without substantial behavioural or ecological modification or diversification, followed by a sudden increase in morphological and ecological innovation. Page 1046...

Journal: :Geological Magazine 2023

Abstract The Sichuan Basin was a part of the Yangtze Carbonate Platform (YCP) during Cambrian–Ordovician, and marine carbonates were deposited in basin this interval. Although previous studies have evaluated paleogeography, paleoclimate paleoecology basin, they primarily focused on biological evolution basin; however, analysis paleogeography is lacking. This study integrated outcrop sedimentolo...

Journal: :Minerals 2023

The thick Upper Cambrian Xixiangchi dolostones, developed in the Sichuan Basin, are an important deep exploration target, but their genesis is still controversial, which hinders predicting porous dolomite distribution and related potential hydrocarbon play. Herein, based on observation sampling of field outcrops, combined with a microscopic thin section analysis, cathodoluminescence geochemical...

Journal: :Frontiers in Earth Science 2023

The Upper Cambrian Xixiangchi Formation in the Southern Sichuan Basin, China, has favorable hydrocarbon accumulation conditions. factors and enrichment conditions of this formation were key considerations study. By analyzing core, thin section, seismic, geochemical data, research shows that there are many sets granular crystalline dolomite reservoirs vertically, with thickness single-reservoir....

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