. Geology and water resources of a portion of Southeastern South Dakota . washingto:n^ GOVERNMENT PRINTING OFFICE1900 CK^k -^mSSv^^s^itu. -^SSa. LIBRARY OF GOMQRISi |V| LC Control Numb? tmp96 026352 UNITED STATES (GEOLOGICAL SURVEY CHARLES D. WALCOTT. DIRECTOR K- 1^ ?ii GEOLOGY AND WATER RESOURCES OF A PORTION OF SOUTHEASTERN SOUTH DAKOTA BT JAJvlES EI3\\^AR33 TODD. WASHINGTON GOVERNMENT PRINTING OFFICE 1900 CONTENTS. Page, Letter of transmittal 9 Location of region 11 General geology 11 Algonkian , 12 Sioux quartzite 12 The Paleozoic gap 12 Cretaceous 13 Dakota sandstone 13 Colorado
. Geology and water resources of a portion of Southeastern South Dakota . washingto:n^ GOVERNMENT PRINTING OFFICE1900 CK^k -^mSSv^^s^itu. -^SSa. LIBRARY OF GOMQRISi |V| LC Control Numb? tmp96 026352 UNITED STATES (GEOLOGICAL SURVEY CHARLES D. WALCOTT. DIRECTOR K- 1^ ?ii GEOLOGY AND WATER RESOURCES OF A PORTION OF SOUTHEASTERN SOUTH DAKOTA BT JAJvlES EI3\\^AR33 TODD. WASHINGTON GOVERNMENT PRINTING OFFICE 1900 CONTENTS. Page, Letter of transmittal 9 Location of region 11 General geology 11 Algonkian , 12 Sioux quartzite 12 The Paleozoic gap 12 Cretaceous 13 Dakota sandstone 13 Colorado formation 15 Pierre shale u 17 Tertiary deposits 17 Pleistocene deposits 17 Preglacial or circumglacial deposits 17 Till or bowlder clay 18 Moraines 21 Ancient drainage systems 22 Water supply 22 Surface waters 22 Lakes 22 Springs 23 Streams 24 Underground waters 24 Water from the older strata 26 Main artesian supply 26 Pressure 28 Variation of pressure 28 Hints on the construction of wells 30 Permanence of artesian supply 30 5 ILLUSTRATIONS. Pa^ I. Index map of eastern South Dakota, showing area under consider: i- tion 11 II. Prehminary map of a part of southeastern South Dakota, comprisingportions of Hutchinson, Yankton, and Bonhomme counties, show-ing depths to artesian waters Pocket. III. Geological map of a portion of eastern South Dakota 12 IV. Map of a
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