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BOOK
Author Anderson, Raymond R.,
Title Clastic rocks associated with the Midcontinent Rift System in Iowa / by Raymond R. Anderson and Robert M. McKay.
Imprint [Washington, D.C.] : U.S. G.P.O. ; Denver, CO : U.S. Geological Survey, Information Services, 1997.

LOCATION CALL # STATUS MESSAGE
 MUSKINGUM QUARTO  QE75 .B9 no. 1989-I    AVAILABLE  NON-CIRC
LOCATION CALL # STATUS MESSAGE
 MUSKINGUM QUARTO  QE75 .B9 no. 1989-I    AVAILABLE  NON-CIRC
Author Anderson, Raymond R.,
Series U.S. Geological Survey bulletin ; 1989-I.
Strategic and critical minerals in the midcontinent region, United States ; ch. I.
Strategic and critical minerals in the midcontinent region, United States ; ch. I.
U.S. Geological Survey bulletin ; 1989-I.
Subject Geology, Stratigraphic -- Proterozoic.
Geology -- Iowa.
Keweenawan Rift.
Alt Name McKay, Robert M.,
Geological Survey (U.S.)
Description v, 45 pages : illustrations, maps ; 28 cm.
Note Shipping list no.: 97-290-P.
Bibliography Note Includes bibliographical references (pages 38-40).
Summary The Middle Proterozoic Midcontinent Rift System (MRS) of North America is a failed rift that formed in response to region-wide stresses about 1,100 Ma. In Iowa, the MRS is buried beneath 2,200-3,500 ft of Paleozoic and Mesozoic sedimentary rocks and Quaternary glaciogenic deposits. An extremely large volume of sediments was deposited within basins associated with the rift at several stages during its development. Although the uplift of a rift-axial horst resulted in the erosional removal of most of these clastic rocks from the central region of the MRS in Iowa, thick sequences are preserved in a series of horst-bounding basins. Recent studies incorporating petrographic analysis, geophysical modeling, and other analytical procedures have led to the establishment of a preliminary stratigraphy for these clastic rocks and interpretations of basin geometries. This information has allowed the refinement of existing theories and history of MRS formation in Iowa. Additionally, drill samples previously interpreted as indicating the existence of early Paleozoic basins overlying the Proterozoic MRS basins were re-examined. Samples previously interpreted as deep-lying Paleozoic rocks are now known to have caved from upper levels of the drillhole and were out of stratigraphic position. No deep Paleozoic basins exist in this area. These investigations led to the development of petrographic parameters useful in differentiating the Proterozoic MRS Red clastics from Paleozoic clastic rocks having similar lithologies.
OCLC # 36011670
Additional Format Online version: Anderson, Raymond R. Clastic rocks associated with the Midcontinent Rift System in Iowa (OCoLC)889723513.
Online version: Anderson, Raymond R. Clastic rocks associated with the Midcontinent Rift System in Iowa. [Washington, D.C.] : U.S. G.P.O., 1997 (OCoLC)937435803.


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