Stratigraphy of the Lower Ordovician New Richmond Sandstone in the Upper Mississippi ValleyUniversity of Wisconsin--Madison, 1960 |
Häufige Begriffe und Wortgruppen
approximately authors base beds Beekmantown Beekmantown stage Prairie brecciated brown brown to gray buff buff dolomite Bull Canadian series Beekmantown cemented chert Chien formation Shakopee City concluded Conglomerate continuity correlated County cross cross-bedded crystalline described du Chien formation evidence exposed exposures fact feet Figure fine-grained formation New Richmond formation Shakopee dolomite friable Geol Geological geologists grains rounded gray green shale Highway Illinois Iowa Jordan Limestone lithologic locality Location Lower Magnesian mapped massive measured medium medium-grained MILES Minn Minnesota Missouri nature noted Oneota dolomite member outcrops persistent Peter poorly sorted Powers Prairie du Chien present problem quarry regarded reports Richmond sandstone member rocks rounded and frosted sand sandy Sardeson Section series Beekmantown stage Shakopee dolomite member strata stratigraphic studied term thesis Thickness Thickness Feet Inches thin thin-bedded Top Ordovician unit Univ Upper vuggy Winchell Wisconsin writer zones
Beliebte Passagen
Seite 85 - Subsurface Trenton and sub-Trenton rocks in Ohio, New York, Pennsylvania, and West Virginia, in Galey, JT, ed., Appalachian Basin Ordovician symposium: Am.
Seite 71 - The discrimination of sedimentary formations is based on the local sequence of rocks, lines of separation being drawn at points in the stratigraphic column where lithologic characters change or where there are significant breaks in the continuity of sedimentation or other evidences of important geologic events.
Seite 84 - Heavy minerals in the Roubidoux and other sandstones of the Ozark region, Missouri: Jour.
Seite 75 - Thus, to determine the continuity of a series of strata over a considerable area. Correlation. — The determination of the equivalence in geologic age and stratigraphic position of two formations or other stratigraphic units in separated areas; or, more broadly, the determination of the contemporaneity of events in the geologic history of two areas. Fossils constitute the chief evidence in problems of correlation (La Forge).
Seite 10 - ... Owen in 1840" gave the name "Lower Magnesian" to distinguish it from the "Upper Magnesian," under which term were included both the Galena and Niagara of present nomenclature, Since the discrimination of the thick Maquoketa shale between these two the original significance of the name has been lost, and in accordance with present usage a geographic name for the formation as a whole is proposed in the Lancaster-Mineral Point folio. The old name, Lower Magnesian, was retained by Hall, Whitney,...
Seite 85 - Hall, CW, and Sardeson, FW, 1895, The Magnesian series of the northwestern states! Geol. Soc. America Bull., v. 6, p. 167-198. 59. Hall, JW, and Whitney, J. D«, 1858, Report on the geological survey of Iowa, embracing the results of investigations made during 1855-1857
Seite 86 - Note on some new points in the elementary stratification of the primordial and Canadian rocks of south central Wisconsin.
Seite 71 - Nevertheless, a unit distinguishable from the enclosing rocks only by its fossils shall not, in general, constitute a formation, but is properly classified as a paleontologic zone".
Seite 84 - CULLISON, JS, 1944, The stratigraphy of some Lower Ordovician formations of the Ozark uplift: Missouri School of Mines and Metallurgy Bull., tech.
Seite 83 - Bennettites dacotensis were found and concludes that they represent the Dakota Cretaceous. 693 On a new horizon and some new localities for friable sandstone in which the grains are enlarged by secondary deposition of silica in optical continuity with the original nucleus. Am. Geol., vol. xiii, pp. 225-227, 1894. Describes sandstone beds associated with the Lower Magnesian limestone in Iowa, which are thought to be an equivalent of the New Richmond sandstone of Minnesota and Wisconsin.