Oregon Geology: Sixth Edition

Preface

7 Preface In our periodic revisions of Oregon Geology, we are invariably challenged by the need to address new ideas and trends in research. Since the last edition in 2000, many revolutionary models and theories have been put forward, leaving us to select those which might have lasting merit and those which should be replaced. The overall shift in thinking has been away from general geology and economics and toward tectonics . Among the tectonic concepts, hot spots or mantle plumes have emerged as an elegant explanation for much of the volcanic activity east of the Cascades. Our understanding of events surrounding the accretion of terranes has been further refined, and the unexpected discovery of an enormous caldera in central Oregon has provided answers to many of the unsolved Tertiary volcanic issues there. On a more practical level, we noted an increased emphasis on geologic hazards such as earthquakes and tsunamis as well as an awareness of alterations to the environment that relate to geology. In the area of technology, the use of LIDAR as a geologic tool has been astonishingly effective for recognizing, mapping, and evaluating landslides across Oregon. Because of our reliance on the labors of others , we felt such efforts should be recognized, so, with some trepidation, we added short biographical sketches and photographs of just a few of the noteworthy individuals. ...