Surficial Geology of the Ridgeway (Iowa) 7.5' Quadrangle LEGEND · PDF file 2014. 8....

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Transcript of Surficial Geology of the Ridgeway (Iowa) 7.5' Quadrangle LEGEND · PDF file 2014. 8....

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    Surficial Geology of the Ridgeway (Iowa) 7.5' Quadrangle

    Quadrangle Location

    Base map from USGS Ridgeway 7.5' Digital Raster Graphic (IGS GIS file DRGC39.TIF) which wasscanned from the Ridgeway 7.5' Topographic Quadrangle map, published by US Geological Survey in 1981Topographic contours and land features based on 1975 aerial photography, field checked in 1977Land elevation contours (20' interval) based on NGVD 1929. Iowa Geological Survey digital cartographic file ridgeway08quad_surficial.mxd, version 8/28/08 (ArcGIS 9.2)Map projection and coordinate system based on Universal Transverse Mercator (UTM) Zone 15, datum NAD83.

    The map and cross section are based on interpretations of the best available information at the time of mapping. Map interpretations are not a substitute for detailed site specific studies.

    CALMARPROTIVIN

    DECORAHRIDGEWAY

    BLUFFTON BURR_OAK

    CRESCO_SE

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    91°52'30"W

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    43°22'30"N 43°22'30"N

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    43°17'30"N 43°17'30"N

    43°15'0"N 43°15'0"N

    1:24,000 0 1 2 3 40.5 Miles

    0 1 2 3 40.5 Kilometers GEOLOGIC MAPPING OF THE UPPER IOWA RIVER WATERSHED: PHASE 4: Ridgeway 7.5’ Quadrangle Iowa Geological Survey Open File Map 08-04 August 2008 prepared by Stephanie Tassier-Surine, Robert McKay, Huaibao Liu, and James D. Giglierano Iowa Geological Survey, Iowa City, Iowa

    Iowa Department of Natural Resources, Richard A. Leopold, Director Iowa Geological Survey, Robert D. Libra, State Geologist Supported in part by the U.S. Geological Survey Cooperative Agreement Number 07HQAG0087 National Cooperative Geologic Mapping Program (STATEMAP) ACKNOWLEDGMENTS We thank the staff of the Northeast Iowa RC & D for their efforts in helping to initiate this mapping project and for supporting our work in the Upper Iowa River watershed. New subsurface geologic data was generated by the University of Iowa students Thomas Marshall and Kelly Wilhelm who produced descriptive logs of water well drill samples. Luther College in Decorah actively participated in the project through subcontract 07-7380-01 for field mapping support. Luther College students Gabriel Demuth and Carl Haakenstad were participants in field and office work in support of the mapping effort. Birgitta Meade of Luther College was instrumental in accurately locating and elevating water wells in the map area. Drilling in selected sites was provided under contract by Aquadrill, Inc. of Swisher, Iowa.