Stratigraphically significant compression floras have been found in lower Conemaugh ironstone beds and lower Conemaugh dark argillaceous shales in the 7-11 Mine, Columbiana County, Ohio. The known fauna associated with the ironstone beds is limited to branchiopods, myriapods, and a single arachnid. The dark argillaceous shales yielded both invertebrate and vertebrate fossils including freshwate...

An integrated nomenclature scheme is proposed to capture the inherent heterogeneity of fine-grained sedimentary rocks at the 102 to 1023 mm scale and to assist the evaluation of these rocks as sinks of organic carbon, barriers to fluid flows, and reservoirs of oil and gas. This scheme incorporates previous knowledge and the latest field, petrographic, and laboratory observations. We propose to ...

Low resistivity in argillaceous sandstone reservoirs may be attributed either to the effect of microporosity, or to specific effects due to clays and/or to conducting minerals. In the frame of a study on pore lining chlorite bearing sandstones, from different hydrocarbon reservoirs, measurements of cation exchange capacities and specific surface areas have been performed, on whole rocks as well...

Argillaceous Lindsay limestone is the geologic storage formation that will be encountered at the site for the construction of a deep ground repository in Ontario, Canada, for the storage of low to intermediate level nuclear waste. The permeability of the Lindsay limestone is a key parameter that will influence the long-term movement of radionuclides from the repository to the geosphere. This pa...

The carbonate phase of impure sideritic concretions from a sequence of argillaceous sediments from the Westphalian of Yorkshire has been analysed using an acid-dissolution technique and corrections allowing for the decomposition of non-carbonate minerals applied to obtain accurate compositional formulae. The siderites show considerable compositional variation, some containing Ca in excess of an...

The uptake of Zn by Illite du Puy (IdP) and two argillaceous rocks, Opalinus Clay (OPA) Boda Claystone (BODA) was investigated. illite studied in 0.1 M NaCl at near-neutral pH loadings varying from 2.1 to 42 mmol/kg. the rock systems carried out 7.2 their respective porewaters 8.0 evaluate influence porewater composition. varied 1.8 86 mmol/kg 1.7 60 for OPA BODA, respectively. simplified “bott...

The Neogene Guantao Formation Reservoir in the PLOilfield is a unconsolidated sandstone with high porosity and permeability. reservoir diagenesis weak dominated by compaction diagenesis. At present, insufficient research into relationship between pore characteristics sedimentary microfacies of shallow delta reservoirs restricts prediction favorable distribution. This article takes as object ana...