First posted May 13, 2022 For additional information, contact: Florence Bascom Geoscience CenterU.S. Geological Survey926A National Center12201 Sunrise Valley DriveReston, VA 20192Contact Pubs Warehouse The study area consists of four contiguous 7.5-minute quadrangles and is located in Frederick Clarke Counties, Virginia, Berkeley Jefferson West Virginia. individual are Stephenson, Winchester, ...

This presentation provides an overview of a major field focused program of studies aimed at improved investigation methods and understanding organic contaminant source zones and plumes in fractured porous sedimentary rock. This research began in 1997, when intensive field studies were initiated at a TCE contaminated site on steeply dipping and faulted sandstone in California. Now, with collabor...

Two texturally and mineralogically distinct types of Mississippi Valley-type mineralization are hosted by the upper Cambrian Metaline Formation in northeastern Washington. Josephine-type mineralization is iron poor and coarse grained, whereas Yellowhead-type mineralization is iron rich, fine grained, and commonly botryoidal. Josephine mineralization is found largely in the Josephine lithofacies...

O início da exploração do pré-sal é um dos marcos mais importantes história geológica e econômica Brasil. Com a enorme disparidade positiva entre produção prevista antes após pré-sal, há cada vez mobilização por parte de empresas pesquisadores estudos caracterizando as rochas-reservatório dessa camada. presente trabalho tem como finalidade caracterização petrográfica amostras rochas carbonática...

The Qiangtang Mesozoic sedimentary basin is a new field of hydrocarbon exploration, in which the Buqu Formation dolostone reservoirs have attracted increasing attention recent years. To determine origin these reservoirs, petrographic study, fluid inclusion thermometry dating, and C-O Sr isotopic dating were performed. results revealed genesis evolution different types dolomite matrix cement, as...

Ever since it was first proposed that the Earth completely froze during glaciations ∼ 640 million years ago evidence supporting this hypothesis has been increasing, primarily from samples of carbonates directly overlying glacial diamictites, termed cap carbonates. However, not extensive period affected planet Earth: ∼1750 prior to Neoproterozoic went through its major episode, early Paleoproter...

The Toirano karst system is located in the Ligurian Alps (north Italy), around 4.5 km inland from coastline and carved Middle Triassic dolostone. It comprises five cave levels over a 154 m altitudinal range, specifically Ulivo (340 a.s.l.), Colombo (247 Upper Santa Lucia (215 Lower (201 a.s.l.) Bàsura (186 caves. active at lower altitudes, as testified by thermal spring currently 70 a.s.l. alon...