NOTE: This map is the product of collaboration of State geological surveys and the U.S. Geological Survey and is designed for both scientific and practical purposes. It was prepared in two stages. First, separate maps and map explanations of the parts of States included in the quadrangle were prepared by the State compilers. Second, these maps were integrated and locally supplemented by the editors; map unit symbols were revised to a uniform system of classification; and map unit descriptions were prepared from information received from State compilers and from additional sources. Diagrams accompanying the map were prepared by the editors. Differences in mapping or interpretation in different areas were resolved by correspondence to the extent possible. Most simply reflect differences in available information or in philosophies of mapping and should encourage further investigation. Less than forty percent of the surficial deposits of the United States have been mapped and described. Traditionally, mapping of surficial deposits has focused on glacial, alluvial, eolian, lacustrine, marine, and landslide deposits. Slope and upland deposits have been mapped in detail only in restricted areas. However, an enormous amount of engineering construction and many important problems of land use and land management are associated with regions that have extensive slope and upland deposits (colluvium, residuum, and saprolite, for example). These materials have many different physical characteristics. Therefore, an effort has been made to classify, map, and describe these deposits, based in large part on unpublished interpretations, published and unpublished subsoil data, and the distribution of bedrock parent materials. The classification is crude, but represents a first step toward a more refined and useful product. For scientific purposes, the map differentiates Quaternary surficial deposits on the basis of a combination of criteria, such as lithology, texture, genesis, stratigraphic relationships, and age, as shown on the correlation diagram and indicated in the map unit descriptions. Some geomorphic features, such as end moraines, are distinguished as map units. Erosional features, such as stream terraces, are not distinguished, and differentiation of sequences of alluvial deposits of different ages is rarely possible at a scale of 1:1,000,000. Most landslide deposits are too small to be shown at this scale. For practical purposes, the map is a surficial materials map. Materials are distinguished on the basis of texture, composition, and local specific characteristics such as swelling clay. It is not a map of soils as soils are recognized and classified in pedology or agronomy. Rather it is a generalized map of soils as recognized in solifluction, mudflow, frost heave, and, locally, landslide. 2 DECOMPOSITION RESIDUUM, for purposes of this map, is defined as material derived primarily by in-place chemical decay of clastic rock with no appreciable subsequent lateral transport. 3 SOLUTION RESIDUUM, for purposes of this map, i...
These cross sections are the fifth publication in a folio of maps of the Harrison 1 o x 2 o quadrangle, Missouri and Arkansas, prepared under the Conterminous United States Mineral Assessment Program (CUSMAP). Previously published maps in this folio relate to the geochemistry of the subsurface carbonate rocks (Erickson and others, 1989), the geophysics of the basement terranes (McCafferty and others, 1989), the sedimentary rocks and mineralization of the Caulfield district (Hayes and others, 1992), the mineralresource potential of the quadrangle (Pratt and others, 1993), and the bedrock geology of the quadrangle (Middendorf and others, 1994 and in press). A final set of maps showing locations of known Mississippi Valley-type deposits and occurrences relative to Late Cambrian shaly lithofacies and other shales in the Harrison and adjoining quadrangle is in preparation (Palmer and Hayes, in press).
The rocks exposed in the Harrison quadrangle are exclusively sedimentary. They range in age from Early Ordovician to Middle Pennsylvanian and are represented principally by dolostone and limestone, although sandstone, and to a lesser degree shale, are also present. Bedrock outcrops are common, but of limited areal extent. The bedrock is usually covered by a relatively thin layer of surficial materials (soil, residuum, colluvium and (or) alluvium). The stratigraphic nomenclature of the quadrangle is summarized in figure 1.The Harrison quadrangle is in a stable cratonic region on the southwest flank of the Ozark uplift and contains a moderate number of mapped faults. High-angle normal faults and long, narrow grabens are dominant. A northwest trend in the eastern three-quarters of the northern half of the quadrangle changes to east-west and northeast in the western part. In the northeastern part of the quadrangle, discontinuous faults extending from T. 27 N., R. 14-15 W., to T. 24 N., R. 10 W., are along the trend of the Bolivar-Mansfield tectonic zone, which extends into this quadrangle from the Springfield quadrangle to the north (see others, 1991, andKisvarsanyi, 1991). Similarly, in the west-central part of the quadrangle, a sinuous fault extending from T. 23 N., R. 22 W., into T. 21 N. (Missouri), R. 20 W., is approximately along the trend of the Chesapeake tectonic zone in the Springfield quadrangle. Structures in Canadian post-Roubidoux Formation units are difficult to discern because of the great thickness of the units and the lack of good marker beds. In the southern half of the quadrangle, two major faults and at least one minor fault are discernible; major structural trends are northeast and east-west, and a minor west-northwest trend is apparent.This map is the product of two different state geological surveys whose approaches to geologic mapping and interpretations of regional stratigraphy are similar but not identical as are the rocks themselves. In particular this is true of the Lower Mississippian strata, which in Missouri are divisible into two mappable units but in Arkansas are lumped as the Boone Formation (see fig. 1); the lower part of the Boone, designated in Arkansas as the St. Joe Limestone Member, consists of the same four units as the lowermost Mississippian in Missouri, but is too narrow in outcrop width to be mapped separately. Consequently the Description of Map Units that follows is divided into two sections, one for Missouri and the other for Arkansas. "State-line" contacts at the Missouri-Arkansas border are artificial and indicate only the change in map units, not a change in the nature of the rocks.
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