This is an analysis of fractures occurring within the Paloezoic sedimentary rocks in a portion of southeastern Indiana. Fifteen hundred seventy-two fractures were used in analysis of distribution, orientation, pervasiveness, persistence, and intensity. The data collected is representative of eight counties and seventeen different collection sites.All fracture data were given an associated numerical value identifying each variable used for analysis and recorded into computer data files. A computer program was used for statistical analysis and construction of equal area nets which graphically displayed the distribution of variables. The compilation of the fracture data allowed for close interpretative analyses of variables and correlation of the orientation and distribution of the fractures within the study area.This study revealed that two orthogonal fracture systems exist in southeastern Indiana. The fracture set containing the largest percentage of those measured is oriented N11W with its compliment oriented N73W. The orientation of the second largest fracture set is N8E with its compliment oriented N82°W.The effects of the tectonic history as well as contemporary stress on the area are discussed relative to their effects on the overall distribution of fracture sets.Evidence is presented to substantiate a reactivation of the Cincinnati Arch as indicated in the Devonian-Mississippian lithologic units from data collected in the southeastern portion of the study area. Fracture data correlating to these units displays a rotation of the major fracture set maxima 90w. This data is supported by radiometric dates from the Belfast member of the Brassfield Limestone in which Laskouski, et.al., correlated a reactivation of the arch.Also within this study are lithologic descriptions of all the Paleozoic formations used for data collection. These descriptions were developed over a three year period from extensive field observation.A map of the study area is presented displaying the distribution and orientation of the fractures recorded at each data collection site. / Department of Geology

Deep-water clastic sediments of the lower Paleozoic continental margin in the Quebec City area are piled up in imbricated thrust sheets and nappes constituting the External Domain of the Northern Appalachians. The youngest sediments (Middle Ordovician Citadelle and Quebec City Formations) occu

This paper describes the Mississippian. Exshaw, Banff and Rundle units, a remnant of ? Pennsylvania strata and cherty sandstones of the Permian Ishbel Group; paleontological details include information on the megafossils, foraminifers and algae. The Exshaw Formation includes a sanidine bearing tuffaceous sandstone. The Banff was subdivided into four rock units - Basal Shale, Cherty Unit, Crinoidal Unit and Upper Unit. The Rundle Group was divided into the Pekisko, Shunda, Turner Valley and Mount Head Formations. The term Jasper Lake Formation is applied to a sequence of crinoidal biosparites and dolomites at the South Berland River section which are bank-marginal lateral equivalents of eastern Shunda micrites. The Mississippian rocks of the three stratigraphic sections upon which this study is based are assigned to eight main petrographic facies and six petrographic subfacies. Facies A - calcisiltite: argillaceous crinoidal biomicrite and associated calcareous shales Facies B - an interbedded sequence offacies A and B Facies C - calcarenite: argillaceous crinoidal biomicrite Facies D - calcarenites: crinoidal biosparite Subfacies Da - calcarenite: ‘mature’ crinoidal intrasparite Subfacies Db - calcarenite: intraclast bearing crinoidal biosparite Facies E - oolitic and/or grapestone bearing calcarenites Subfacies Ea - fossiliferous intraclast bearing oosparite Subfacies Eb - intrasparites and sparry intramierites; four lithotypes are recognized (1) oolitic micritic crinoidal intrasparite (2) grapestone bearing intrasparite (3) oolite bearing partially merged intrasparite (4) grapestone and oolite bearing, sparry intramicrite Facies F - pure limestone micrites Subfacies Fa - crinoidal micrite Subfacies Fb - micrites, pelsparites, pelmicrites and dismicrites Facies G - unfossiliferous micrograined dolomite, commonly with microbedding Facies H - dolomite breccias The progression through the facies and subfacies from A to H reflects a change in depositional environment from that of normal marine deep quiet waters to lagoonal and evaporitic conditions; modern sedimentation of the Bahama Banks is used as a partial model. The facies distribution pattern for the Rundle carbonates of the area shows a tendency toward lagoonal facies in the east (Mturtm Creek section), bank-marginal facies in the west (South Berland River section) and intermediate facies at the Eagles Nest Pass section. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

The stratigraphy and structure of Upper Palaeozoic and Mesozoic sedimentary and volcanic rocks, and of amphibolitic rocks of unknown age, were studied in an area of about 140 square miles in the Cascade Mountains of southwestern British Columbia. The amphibolitic rocks are probably of diverse origins; their stratigraphic relationship to the other rocks is not known, although they may, in part, be equivalent to pre-Devonian rocks in northwestern Washington. Upper Palaeozoic rocks comprise the Chilliwack Group. The base is not exposed. Oldest rocks are volcanic arenites and argillites which are overlain by an argillaceous limestone, about 100 feet thick, in which Early Pennsylvanian (Morrowan) fusulinids occur. Apparently conformably overlying the limestone is a succession of argillites, coarse volcanic arenites, minor conglomerate and local tuff, which contains both marine and terrestrial fossils and ranges in thickness from 450 to 800 feet. A cherty limestone, generally about 300 feet thick, in which there is an Early Permian (Leonardian) fusulinid fauna, is conformable upon the clastic sequence. Altered lavas and tuffs are in part laterally equivalent to this Permian limestone, and, in part, overlie it; these volcanic rocks range in thickness from 700 to 2,000 feet. Disconformably above the Permian volcanic rocks are argillites and volcanic arenites of the Cultus Formation. This formation is apparently about 4,000 feet thick, contains Late Triassic, Early and Late Jurassic fossils and no stratigraphic breaks have been recognized within it. All of these rocks underwent two phases of deformation between Late Jurassic and Miocene time. The first phase, correlated with mid-Cretaceous deformation in northwestern Washington, was the most severe., and thrusts and major, northeast-trending recumbent folds were formed. These structures subsequently were folded and faulted along a northwest trend, possibly in response to differential uplift of the Cascade Mountains. / Science, Faculty of / Earth, Ocean and Atmospheric Sciences, Department of / Graduate

No description available.

No description available.

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1981. / Microfiche copy available in Archives and Science / Includes bibliographies. / by Jon Eric Spencer. / Ph.D.

<p> The Paleozoic bedrock surface of southern Ontario is dissected by an interconnected system of buried bedrock valleys that are infilled with thick successions of glacial, interglacial and fluvial sediments. These valleys can be several kilometers wide, reach depths of up to 250m and the coarse-grained units are known to host significant local and regional groundwater aquifers.</p> <p> Two buried bedrock valleys located near the Niagara Escarpment in the Region of Halton were under investigation in the fall of 1999 for their potential to host additional municipal groundwater aquifers to supply drinking water to the towns of Milton and Georgetown. Detailed logging of sediment recovered from eleven continuously-cored boreholes, drilled within the Georgetown and Milton bedrock valleys, forms the basis for this study. Four distinct facies types were identified within the borehole cores including sand, gravel, fine-grained sediment and diamict (sand-rich, mud-rich and clast-rich). These four facies types were used to subdivide the cores into six stratigraphic units based on textural characteristics and stratigraphic position. These six units form a stacked succession of aquifers and aquitards within the valley infill with two stratigraphic units being identified as potential municipal aquifers.</p> <p> The Georgetown buried bedrock valley contains narrow bedrock channel interpreted to have been fluvially incised, lying within a broader flat-bottom valley likely formed by glacial scouring of the bedrock. It is feasible that regional bedrock jointing created a zone of weakness that was later exploited by a drainage network. The valley infill sediments record the approach of the Laurentide Ice Sheet into southern Ontario during the Early to Mid-Wisconsin, and the subsequent overriding of the area during the Late Wisconsin period.</p> / Thesis / Master of Science (MSc)

No description available.

No description available.