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Showing 1 to 20 of 198 for “"Devonian"”.
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Kerogen variation in a Devonian half graben system
The Middle Devonian Rousay Flagstone Formation of Orkney is a 200m thick lacustrine succession that contains abundant preserved organic matter. It was deposited into a series of half graben formed by the collapse of over-thickened Caledonian crust. The 14 lake cycles that comprise the Rousay …
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Fauna of the Accraian series (Devonian of Ghana)
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1960.
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The Applications of palynostratigraphy to the Devonian of Bolivia
… from this section to validate the cuttings-based Devonian subsurface palynostratigraphy. Similar palynological trends were identified in the same stratigraphic order as seen in the subsurface. A detailed study of the chitinozoan fauna was undertaken and 36 taxa were identified of which 9 are new …
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THE MIDDLE DEVONIAN WINNIPEGOSIS FORMATION OF WEST-CENTRAL SASKATCHEWAN
The Winnipegosis Formation of west-central Saskatchewan consists of three members which are, in ascending order, the Lower Winnipegosis Member (Lower Member), the upper Winnipegosis Member (Upper Member) and the Ratner Member. The Lower Member is regionally developed, 20 to 50 feet. in thickness, …
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Pre-Chattanooga Devonian Stratigraphy of Alabama and Northwest Georgia
Made available in DSpace on 2014-12-11T18:09:53Z (GMT). No. of bitstreams: 1 7114827.pdf: 5441267 bytes, checksum: 5f7c96d64e1c162a4814d47d7b29336c (MD5) Previous issue date: 1970
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Geographical variation and evolution in the Middle Devonian brachiopod, Mucrospirifer
The Middle Devonian brachiopod, Mucrospirifer, was studied over most of its geographical and stratigraphical range in order to test the theory of punctuated equilibria. Punctuated equilibria holds that most evolution is concentrated in rapid speciation events and that the subsequent lifespan of a …
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A quantitative study of composite Devonian lithofacies in the Michigan Basin
Thesis (M.S.)--Michigan State University of Agriculture and Applied Science. Dept. of Geology and Geography, 1955
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Stratigraphy of the Devonian Guilmette Formation, Pahranagat range, Lincoln County, Nevada
Includes bibliographical references.
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Alamo impact event, Late Devonian, Nevada: crater phenomena and distal products
Includes bibliographical references.
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Late Silurian and Early Devonian fossil plants of Bathurst Island, arctic Canada
… in rocks of Late Silurian and Early Devonian age. Specimens of some taxa are numerous and, sometimes, almost complete, allowing analysis of intraspecific variability, developmental patterns and reconstruction of the whole plant. The majority of plant fossils are derived from the …
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The sedimentology and palaeogeography of some Devonian sedimentary rocks in Southwest Ireland
… and plant miospores date the basin-fill as Upper Devonian in age, possibly just extending down into latest Middle Devonian. Miospore assemblages allow regional correlation with other areas in the Munster Basin. Minor igneous intrusive and extrusive rocks in the area have been mapped and described, …
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Sedimentation of the Siluro-Devonian clastic wedge of Somerset Island, Arctic Canada
Abstract not available.
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Conodonts of the Bakken Formation (Devonian and Mississippian), Williston Basin, North Dakota
… the Bakken Formation in North Dakota is Late Devonian and Early Mississippian in age. A small conodont fauna from the lower shale includes species of Palmatolepis and Polygnathus and is tentatively considered of the Upper Polygnathus styriacus Zone (Famennian). Species of Siphonodella, …
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Depositional environments and diagenesis, Winnipegosis Formation (Middle Devonian), Williston Basin, North Dakota
<p>In the Williston Basin, the Winnipegosis Formation is the major carbonate unit of the initial transgressive-regressive pulse of the Kaskaskia sequence. Twenty-two lithofacies were identified by well-log, core, and thin-section studies of Winnipegosis rocks; these belong to seven environments of …
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Origin of Green Shales in the Devonian Swan Hills Formation, Alberta, Canada
Throughout its growth history, the Devonian Swan Hills Reef Complex at Swan Hills has been subjected to variably long episodes of subaerial exposure, storm events, strong wind, oceanic currents, base level fluctuations and/or a long post-depositional burial history. For nearly sixty years, several …
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