1 Environmental Services Division Iowa Geological Survey and Land Quality Bureau Supported by the U.S. Geological Survey Cooperative Agreement Number 04HQAG0067 National Cooperative Geologic Mapping Program (STATEMAP) Iowa Department of Natural Resources Jeffrey R. Vonk, Director We thank Lora Friest and Adam Kiel of the Northeast Iowa RC & D for inspiring, prompting, and supporting our work in the Upper Iowa River watershed. University of Iowa students Ryan Clark, Ben Belgarde, and Darice Roberts worked on this project and produced descriptive logs of water wells in the Decorah Quadrangle that were our principle source of new subsurface data for geologic mapping. Luther College in Decorah actively participated in this project through subcontract 04-7380-01 for field mapping support. Luther College students Gabriel Demuth, Steffan Merten, Will Viner, Meghan Minner, and Jared Bendel were participants in the field work to support the mapping effort. Deep drilling in selected sites in the Decorah Quadrangle was provided under contract by Aquadrill, Inc. of Coralville, Iowa . Special thanks to the landowners who graciously allowed access to their land for drilling: Rose Kittleson, Tom Jewel, Bob Jewel, Jr., Duane Kuehner, Corbin Schempp and Lucy Schempp. Other logistical assistance with drilling locations was provided by Dave Stanley of Bear Creek Archaeology in Cresco. Assistance obtaining drilling records and geologic information was provided by staff at Bear Creek Archaeology and Joe Artz at the Office of the State Archaeologist. 1 Iowa Geological Survey , Iowa City, Iowa 2 Luther College, Decorah, Iowa GEOLOGIC MAPPING OF THE UPPER IOWA RIVER WATERSHED Phase 1 : Decorah 7.5’ Quadrangle Iowa Geological Survey Open File Map 2005-1 June 2005 Prepared by Stephanie Tassier-Surine 1 , Greg Ludvigson 1 , Brian Witzke 1 , Jean Young 2 , Ray Anderson 1 , Robert McKay 1 , Paul Liu 1 , Bill Bunker 1 , and David Pals 1 ACKNOWLEDGEMENTS