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Showing 1 to 12 of 12 for “"Lower Devonian"”.
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Conodont biostratigraphy and paleoecology of the Lower Devonian Helderberg Group of Virginia
… member of the Keyser is assignable to the basal Devonian woschmidti zone; (3) the remainder of the Helderberg Group is no younger than the delta zone; and (4) the basal Needmore Shale at the Price's Bluff section is assignable to the serotinus, patulus, or costatus costatus zones, of uppermost …
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Stratigraphy and structure of the Silurian and lower Devonian rocks at Highland Mills and Cornwall, New York
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Geology, 1960.
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Taphonomy, palaeoecology and taxonomy of an ophiuroid-stylophoran obrution deposit from the Lower Devonian Bokkeveld Group, South Africa
The Lower Devonian Voorstehoek Formation is a fossil-rich, siliciclastic unit (Ceres Subgroup, Bokkeveld Group, Cape Supergroup) in South Africa. This Emsian unit contains a highly endemic benthic fossil biota characteristic of the cool to cold water Malvinokaffric Realm of southwestern Gondwana. …
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Geology of the Spruce Run Mountain area, Giles County, Virginia
… area range in age from Middle Cambrian to Lower Devonian. All the rocks are sedimentary rocks deposited in a marine environment and have an aggregate thickness of approximately 6,500 feet. An important disconformity separates rocks of Lower Ordovician age from those of Middle Ordovician …
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The geothermal potential of Luxembourg
… surface heat-flow values are significantly lower (65–80 mW m–2) and indicate that the plume-related heating has not yet entirely reached the surface. Once conceptual geological models are established and the thermal regime is assessed, the geothermal potential of Luxembourg and the …
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Evolution and Anatomy of Early Terrestrial Arthropods: Insights from the Rhynie Chert
… for understanding this transition is the Lower Devonian (ca. 408 Ma) Rhynie chert of Aberdeenshire, Scotland. Preserved in extraordinary three-dimensional detail by silica sinters from ancient hot springs, the Rhynie chert represents the earliest complex land animal ecosystem in the fossil …
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Studying Redox Conditions of Devonian and Neoproterozoic Oceans Using I/ca Proxy From Bulk Carbonate Rocks
… rocks to reconstruct ocean redox changes during Devonian in Laurentia and during Neoproterozoic in South China, to investigate the relationship between ocean redox, paleoenvironmental changes and biotic events. Chapter 1 focuses on a Mid-Devonian core from Appalachian Basin. I/Ca ratios are …
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The Carboniferous Courceyan-Chadian) Sedimentary Facies Mosaic of the Keel -Ardagh Area of County Longford, Eire
… and sedimentary environments of the Silurian, Devonian and Lower Carboniferous lithologies in the Keel area are deduced and described. This was accomplished by the analysis of over 10.000M. of diamond drilled core from the area. <br/><br/>The oldest rocks are Silurian shales with turbidites. …
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Igneous and metamorphic processes in the Shap Granite and its aureole
… is a post—orogenic granite intruded during the Lower Devonian (ie 394 Ma) into rocks of Ordovician to Siturian age. It is of adamellite composition and is notable in having megacrysts of orthoclase which crystallised late (relative to the matrix) by an essentially metasomatic process. Late in …
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Tectonics and sedimentation in the Devonian and carboniferous rocks of SW Devon, England.
… with a different style of deformation. In the Lower to Upper Devonian rocks of the southern zone, slip vectors, vergence and facing of D 1 folds indicate that the transport direction is to the north west. The northern zone, comprising Upper Devonian and lower Carboniferous strata, extends into …
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Geology and mineral resources of the Goose Creek area near Roanoke, Virginia
… shales are about 800 feet thick. Silurian-Lower Devonian rocks represented by the Clinch, Clinton, and Helderberg formations are 15 (?) to 300 feet thick. Additional unclassified shales are of Devonian age. Locally Quaternary deposits of colluvium, older terrace gravels, and alluvium cover …