Abstract The depositional environment of Gumai formation is still challenging to be studied. Previous studies the in Formation show a debate interpretation transition, shallow marine, and deep marine environment. study's objectives are identify lithology characteristics Baturaja region determine potential Formation. Miocene clastic sedimentary rocks well-preserved features Simpang Muara Dua, So...

Abstract New investigations of petrographic and geochemical characteristics Mesozoic sandstones from the northwestern Gulf Suez in Egypt have been undertaken, documenting dominance quartzose containing on average ~ 5% mostly sedimentary subordinately metamorphic lithic fragments (siltstone, sandy siltstone, and, more rarely slate, metasiltstone, limestone, dolostone, quartz-muscovite schist, gn...

pillow lavas are locally conspicuous. A unit consisting of dark, thinly bedded sandstone and siltstone, lccally ranging to several hundred feet thick, is lowermost in the exposed section. The middle division consists of about 3,500 feet of mixed andesi.:e and basalt volcaniclastic rocks ~ lahar, tuff breccia, volcanic sandstone, and conglomeratic beds which rest on relatively thin, fossiliferou...

Organic-rich lacustrine shales in the Upper Triassic Yanchang Formation with thermal maturity mainly oil window are main shale and gas system strata of Ordos Basin, China. Pore systems important for storage transfer gas. The objectives this study to identify pore types structures investigate controlling factors types, structures, total porosities Shale. In study, organic-rich mudstones, mudston...

Changes in the record of vertebrate-assemblage zones in the Karoo Basin, South Africa, serve as a model for the response of terrestrial ecosystems to the end-Permian biotic crisis. Vertebrate turnover from the Daptocephalus to Lystrosaurus Assemblage Zone is believed to have begun with the appearance of subtle siltstonecolor variance and is coeval with a unique, laminated lithofacies, both of w...