Map and data for Quaternary faults and folds in Oregon By Stephen F. Personius, Richard L. Dart, Lee-Ann Bradley, and Kathleen M. Haller This report is preliminary and has not been edited or reviewed for conformity with U.S. Geological Survey standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Open-File Report 03-095 U.S. Department of the Interior U.S. Geological Survey CONTENTS Introduction ................................................................................................... 1 Strategy for Map and Database ................................................................................ 2 Synopsis of Quaternary Faulting and Folding in Oregon....................................................... 4 Sources of Data............................................................................................................................ 4 Overview of Quaternary Tectonic Setting ............................................................................................ 5 Acknowledgments ............................................................................................. 6 List of Contributing Individuals ............................................................................... 7 Definition of Database Terms and Glossary .................................................................... 8 Fault and Fold Database ......................................................................................21 580, Faults near The Dalles....................................................................................................................................................................................................................................22 708, Unnamed faults near Jaussaud Creek.............................................................................................................................................................................................25 709, South Grande Ronde Valley faults....................................................................................................................................................................................................27 710, Ukiah Valley faults............................................................................................................................................................................................................................................30 711, Sumpter Valley faults......................................................................................................................................................................................................................................33 712, Unnamed East Baker Valley faults...................................................................................................................................................................................................35 713, Powder River Peninsula fault zone...................................................................................................................................................................................................37 714, Helvetia fault............................................................................................................................................................................................................................................................41 715, Beaverton fault zone.........................................................................................................................................................................................................................................44 716, Canby-Molalla fault..........................................................................................................................................................................................................................................48 717, Newberg fault...........................................................................................................................................................................................................................................................52 718, Gales Creek fault zone...................................................................................................................................................................................................................................55 719, Salem-Eola Hills homocline....................................................................................................................................................................................................................59 781, Cascadia subduction zone...........................................................................................................................................................................................................................62 782, Blanco transform fault zone.....................................................................................................................................................................................................................76 784, Cascadia fold and thrust belt....................................................................................................................................................................................................................80 785, Unnamed offshore faults..............................................................................................................................................................................................................................83 786, Stonewall anticline.............................................................................................................................................................................................................................................86 787, Bald Mountain-Big Lagoon fault zone.........................................................................................................................................................................................89 788, Fault “J”.........................................................................................................................................................................................................................................................................92 789, Nehalem Bank fault...........................................................................................................................................................................................................................................95 790, Fault “H”.......................................................................................................................................................................................................................................................................98 791, Fault “G”...................................................................................................................................................................................................................................................................101 793, Thompson Ridge fault................................................................................................................................................................................................................................104 794, Coos Basin fault................................................................................................................................................................................................................................................107 795, Heceta Bank structure.................................................................................................................................................................................................................................110 796, Heceta South fault...........................................................................................................................................................................................................................................113 797, Alvin Canyon fault.........................................................................................................................................................................................................................................116 i 798, Daisy Bank fault ...............................................................................................................................................................................................................................................119 799, Wecoma fault.......................................................................................................................................................................................................................................................122 801, Wallowa fault.......................................................................................................................................................................................................................................................125 802, West Grande Ronde Valley fault