The late Early Permian (273–271 Ma) Wandrawandian Siltstone in the southern Sydney Basin of New South Wales represents a marine highstand that can be correlated over 2000 km. A mainly fine-grained terrigenous clastic succession, the Wandrawandian Siltstone contains evidence for cold, possibly glacial conditions based on the presence of outsized clasts and glendonites, mineral pseudomorphs after...

The Late Permian Betts Creek Beds form a succession of coal-bearing alluvial-coastal plain sediments in a basin marginal setting within the northeastern Galilee Basin, Queensland, Australia. The unit is ~ 50–60 m in thickness at Porcupine Creek National Park where outcrop is laterally continuous for several kilometers. Eight facies have been identified within the formation and can be grouped in...

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...

The mineralogy and geochemistry of Paleocene shales and interbedded siltstones in the southwestern of Ahar town (NW Iran) were studied by optical microscopy, XRD, SEM, XRF, and ICP-MS techniques. The mineralogical composition, mainly characterized by calcite, quartz, feldspar, dolomite, muscovite, magnesiohornblende, chlorite, illite, montmorionite, palygorskite, and koninckite, suggests relati...

Gamma ray logs are most useful in identifying subsurface lithology and interpreting depositional environments. This study highlights the use of outcrop gamma-ray along with observations total organic carbon (TOC) analysis to provide stratigraphic framework organic-rich rocks Huai Hin Lat Formation central Thailand. The reveals five sedimentary facies including (1) structureless sandstone, (2) s...

Neogene sedimentary rocks are exposed in the Chittagong Tripura Folded Belt (CTFB) Region Bengal Basin. Sitapahar anticline is situated middle part of CTFB Region. In this structure, eleven litho-facies have been identified fluvial, overbank, shallow marine, deltaic, and deep marine depositional environments. Surma Group composed Bhuban Boka Bil formation during Miocene time was deposited envir...

The Triassic section north of Currie in southern Elko County, Nevada, is almost 500 m thick and is assigned to the Thaynes Group and overlying Shinarump Formation of the Chinle Group. The Thaynes Group disconformably overlies the Permian Gerster Formation and is mostly calcareous shale with interbedded wackestones that yield marine invertebrate fossils, especially ammonoids. The Shinarump Forma...

The Aptian Crato Formation is world renowned for its well-preserved fossils in microbially-induced laminated limestones, which are regarded as one of the main Cretaceous Konservat-Lagerstätte geological record. Detailed stratigraphic investigation and mapping up to 90-m-thick at eastern border Araripe Plateau allowed recognition a regionally persistent fossil-bearing muddy interval, herein defi...

Molecular geochemical methods have shown that it is often dicult to di€erentiate between coaland interbedded shale-sourced oils, even though coals and interbedded shales may exhibit considerable organic in ̄ux variation (e.g. land plant vs algal organic matter) due to the changes of depositional setting. However, compound-speci®c stable carbon isotopic compositions are sensitive to the source i...

One of the most distinguished sandstone geoheritage resources in Khorat Plateau is Hin Chang Si located Nam Phong National Park, Khon Kaen Province. The clastic sedimentary rocks Phra Wihan Formation Group covered this area. As a result lithologic study, consists pebbly sandstone, moderately sorted medium- to coarse-grained and small amount siltstone interbedded with laminated shale. characteri...