taposed along the north-trending, high-angle Nahlin fault; all three tectonic elements are intruded by the Late Cretaceous Atlin Mountain pluton (Figure 1-19-2). The oldest rocks in the eastern domain are Mississippian to Triassic oceanic; crustal and sedimentary rocks of the Cache Creek Complex. These include ultramafite, basalt, limestone, chert, argillite and wacke, and probably a mixed ultr...

The dendrolites composed of light gray massive micrite limestone occur at the top Cambrian Zhangxia Formation in Houziyu Section, Zibo, Shandong Province. Because it is very difficult to study genesis microbial rocks through “the function diagenesis filter,” this paper analyzes its genetic mechanism by characterizing sedimentary fabric and formation environment great significance carbonate depo...

The Dolomites of northern Italy feature some the most intensively studied carbonate rocks worldwide. Yet, little is known about long karst history this mountain range dating back to Miocene. This study scrutinizes three caves (F10, Milchloch and Cioccherloch) in Fanes-Sennes-Prags Nature Park (Province South Tyrol) adjacent Fosses area Natural Ampezzo Belluno, Veneto). Paleo-phreatic passages t...

The sedimentology and palaeogeography of some Devonian sedimentary rocks in southwest Ireland

By systematically reviewing and summarizing the previous studies on petroleum geology of Lunpola Basin, combined with latest oil gas exploration results, accumulation conditions this basin are summarized, favorable zones most potential pointed out. The results show that: ① Paleogene mainly develops three sets source rocks, including Niu-1 section, Niu-2 section lower Niu-3 subsection. lithology...

Willis, K.M., Stern, R.J. and Clauer, N., 1988. Age and geochemistry of Late Precambrian sediments of the Hammamat Series from the Northeastern Desert of Egypt. Precambrian Res., 42: 173-187. Late Precambrian crustal evolution in the Northeastern Desert of Egypt culminated in a major episode of strong extension, accompanied by bimodal igneous activity and deposition of clastic sediments in rest...

the cheshmeh hafez polymetal deposit is located in troud – chahshirin mountain range in southeastern damghan. in this province, the volcanism and associated mineralization are closely related to major faults anjilo and troud with nw-se trend. the exposed rocks in the study area consist of volcano clastic sequence of sandstone, tuff, volcano breccias and mostly andesitic and andesitic- basalt fl...

The min er al ogy of clastic sed i men tary rocks pro vides a re cord of the source re gions up lifted and eroded dur ing orog eny (Dickinson et al., 1983). The Ju ras sic Laberge Group is part of a fold and thrust belt ex posed in the north ern Cor dil lera (Fig. 1). The paleontological and sed i men tary re cord in the Laberge Group mark the up lift and ero sion of crust dur ing the early Jur...

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, ...