Many sedimentary rocks are formed by migration of sand ripples. Thin layers of coarse and fine sand are present in these rocks, and understanding how layers in sandstone are created has been a longstanding question. Here, we propose a mechanism for the origin of the most common layered sedimentary structures such as inverse graded climbing ripple lamination and cross-stratification patterns. Th...

The world-wide and multidisciplinary Science Citation Index (SCI), available presently online as SCI Expanded via Web of Science from the Institute for Scientific Information (ISI) in Philadelphia, has been applied as a powerful and reliable tool for the comprehensive study of citation patterns (GARFIELD 1979). Introductory bibliometric analyses for sedimentological literature were already pres...

The siliceous shale oil and gas in Nadanhada terrane has been studied through field geological survey, geochemistry sedimentary petrology. results show that the area belongs to a good reservoir, rock is brittle suitable for exploitation. abundance of organic matter relatively high. From west east from south north, increases maturity decreases. dynamic metamorphism thermal contact rocks are grad...

In this study, we apply advanced numerical optimization techniques to extend the work of Imhof and Sharma (2005, 2006) to integrate geological and geophysical data and infer the sedimentary parameters that produce a match to seismic data. In particular, we seek to match not just event timing (phase) but also reflection strength (amplitude). This inverse problem of quantitatively matching presen...

The TCG consists of a basal pebble-conglomerate with distinctive black chert clasts overlain by sandstones interlayered with white-purple volcanic ash. All lithologies have experience an episode of post-deposition silicification. Petrographic analysis reveals sandstones are compositionally mature with high abundances of quartz and minor amounts of feldspar and muscovite or biotite mica. Most gr...

The Late Paleozoic is an important epoch of coal-bed accumulation in the North China, particularly its western segment, where a world-class coal field has been found and exploited for three decades. Coal-bearing layers recorded rapid Carboniferous to Early Permian sea-level rise that led evolution shallow marine tidal flat basin, followed by regression resulted formation deltaic facies. However...