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<br /> <br />+ij'\':;~"3 <br />,'I ,'" <br />,j ~~. :..)......v. <br /> <br />INTRODUCTION <br /> <br />The tJ'.S. Geological Survey collected geologic, hydrologic, and <br /> <br />geophysical information from 16 test holes drilled at the Central Great <br /> <br />Plains Field Station during the period June 5 to July 3, 1969. The <br /> <br />Field Station is located about 4 miles east of Akron, Washington <br /> <br />County, Colo. (fig. 1). The test holes were drilled in an area of <br /> <br />about 7 squate miles (fig. 2). The work was done at the request of <br /> <br />the U.S. Department of Agriculture to obtain information on lithologic <br /> <br />variations in the Ogallala Formation of Pliocene age. Observation <br /> <br />wells were installed in the test holes to monitor the movement of <br /> <br />water. <br /> <br />This report presents the basic data collected during the, test,,, <br /> <br />drilling program. The report contains a water-table contour map, a <br /> <br />bedrock contour map, and a generalized section. ,A summary of the <br /> <br />results of the test drilling, a lithologic description, and moisture <br /> <br />content of cores are given in the tables. The geophysical logs are <br /> <br />on file in the Colorado District Office, Water Resources Division, <br /> <br />U.S. Geological Survey, Denver, Colo. and at the Central Great <br /> <br />Plains Field,Station, Akron, Colo. These data will be analyzed <br /> <br />and presented in subsequent reports prepared by the Field Station. <br /> <br />t,' <br /> <br />I <br /> <br />1, <br />;.. ~_ d>i- J.., ,'~ ";,:;" <br /> <br />-""~,- -~ -.;;!;;. <br /> <br />,,,-~-,, <br />