Download or read book Depositional Environments for Strata of Composite Section of Frontier Formation Madison Range Southwestern Montana written by Russell G. Tysdal and published by . This book was released on 1991 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Depositional Environments for Strata of Composite Section of Frontier Formation Madison Range Southwestern Montana written by Russell G. Tysdal and published by . This book was released on 1991 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Depositional Environments for Strata of Composite Section of Frontier Formation Madison Southwestern Montana written by Russell G. Tysdal and published by . This book was released on 1991 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stratigraphy of Mid Cretaceous Blackleaf and Lower Part of the Frontier Formations in Parts of Beaverhead and Madison Counties Montana written by T. S. Dyman and published by . This book was released on 1988 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stratigraphy and Depositional History of the Amsden and Lower Quadrant Formations Snowcrest Range Beaverhead and Madison Counties Montana written by Colin F. Key and published by . This book was released on 1986 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the Late Mississippian-Early Pennsylvanian (latest Chesterian-early Morrowan), a thick sequence of shallow -water carbonate-clastic sediments, equivalent to the "Amsden" and lower Quadrant Formations, was deposited in the Snowcrest trough on the western margin of the northern Rocky Mountain Cordilleran platform in southwestern Montana. Today this late Chesterian sequence is exposed primarily within the Snawcrest Range which trends in a northeasterly direction through Beaverhead and Madison Counties, Montana. Conforming to new Late Mississippian nomenclature for rocks in southwestern Montana, the following stratigraphic units, listed in ascending order, were recognized; the Conover Ranch Formation of the Snowcrest Range Group and the Quadrant Formation. In addition, a relatively thick (325 foot average), unnamed, Shallow water carbonate sequence was recognized between the Conover Ranch and Quadrant Formations. Thus, three stratigraphic units, the Conover Ranch Formation, an unnamed limestone unit, and the Quadrant Formation were recognized and comprise the latest Mississippian-earliest Pennsylvanian strata in the thesis area. The Conover Ranch Formation (late Chesterian) represents a low- energy, marginal marine depositional sequence. The formation consists primarily of red shales and siltstones with occasional quartz arenite -limestone conglomerate lenses. The quartz arenite-limestone conglomerate lenses are thought to represent higher energy, subtidal channel deposits. The Conover Ranch Formation rests unconfonnably upon the Lombard Limestone (Big Snowy equivalent) thoughout much of the thesis area. The unnamed limestone unit (latest Chesterian) was deposited in a shallow-water carbonate shelf environment. The unit consists primarily of wackestones, packstones, and mudstones. Occasionally, an organic-rich mudstone interval was recognized and samples were collected for hydrocarbon source-rock analyses. The unnamed limestone unit grades vertically into a lower dolomitic interval of the Quadrant Formation. Only the lower dolomitic interval of the Quadrant Formation (latest Chesterian? -Morrowan) was studied in this thesis. The sequence consists primarily of dolostones and dolomite - cemented quartz arenites which were deposited in a littoral to neritic environment. The origin of the dolomite is considered to be secondary, resulting from post-depositional diagenetic events. In general, the Late Mississippian -Early Pennsylvanian stratigraphic units in the thesis area reflect a single, major transgressive-regressive depositional sequence. The transgression of the sea onto the Cordilleran platform began with the deposition of the Conover Ranch Formation, reached a maximum during deposition of the unnnamed limestone unit, and began to retreat off the platform at the onset of clastic deposition characteriztic of the Quadrant Formation. The overall hydrocarbon source rock potential of the unnamed limestone unit ("Amsden ") in southwestern Montana is poor.

Download or read book Stratigraphy of Mid Cretaceous Blackleaf and Lower Part of the Frontier Formations in Parts of Beaverhead and Madison Counties Montana written by Thaddeus S. Dyman and published by . This book was released on 1988 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Publications of the U S Geological Survey written by and published by . This book was released on 1991 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1991 with total page 746 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1991 with total page 1690 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Geological Survey Bulletin written by and published by . This book was released on 1983 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Perspectives on the Eastern Margin of the Cretaceous Western Interior Basin written by George W. Shurr and published by Geological Society of America. This book was released on 1994 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains papers on cretaceous rocks in the northern Rocky Mountains, the Great Plains region, the Gulf Coastal Plain of eastern Alabama, and southwestern Minnesota; the Dakota formation; evolutionary and paleological implications of fossil plants from the lower cretaceous Cheyenne sandstone; and fau

Download or read book U S Geological Survey Bulletin written by Carl W. Stover and published by . This book was released on 1983 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication summarizes data for earthquakes that occurred in the 50 states and Puerto Rico during 1985. Descriptions of individual earthquakes include hypocenters, magnitudes, intensities, and damages. The report also contains results from regional networks and data recorded by strong-motion seismographs.

Download or read book Petroleum Abstracts written by and published by . This book was released on 1992 with total page 1716 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography and Index of Geology written by and published by . This book was released on 1990 with total page 1516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1991 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 1991 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: