Maps Showing Inundation Depths, Ice-Rafted Erratics, and Sedimentary Facies of Late Pleistocene Missoula Flood in the Willamette Valley, Oregon

This digital dataset, compiled from previously published and unpublished data sources, contains a personal geodatabase and raster data of features related to the repeated inundation of the Willamette Valley and Portland basin by Missoula Flood waters in Late Pleistocene time. The feature classes contained within the Will_Valley geodatabase are called 'erratics', representing the locations of ice-rafted erratics; 'contours', representing inundation levels associated with stratigraphic evidence of repeated floodings; and 'geology', representing the general distribution of Missoula Flood deposits. A stand-alone table within the geodatabase contains geologic unit descriptions for the geology polygons contained in the 'geology' feature class. Seven ESRI format raster grids are also included in this dataset that illustrate the physiography of the Willamette Valley as well as four important inundation levels. The scale of the source maps limits the spatial resolution (scale) of the database to 1:250,000 or smaller.本数字数据集整合了已发表与未发表的多源数据，包含与晚更新世（Late Pleistocene）米苏拉洪水（Missoula Flood）反复淹没威拉米特谷（Willamette Valley）及波特兰盆地（Portland basin）相关的各类要素的个人地理数据库（personal geodatabase）与栅格数据。 Will_Valley地理数据库内包含三类要素类（feature classes）："erratics"要素类用于表征冰漂漂砾（ice-rafted erratics）的点位；"contours"要素类对应结合反复洪水地层证据得到的淹没水位；"geology"要素类则展示米苏拉洪水沉积物的整体分布范围。 该地理数据库内置一张独立数据表，用于描述"geology"要素类中地质多边形对应的地质单元信息。 本数据集还包含7份ESRI格式栅格，可用于呈现威拉米特谷的地貌特征与4处关键淹没水位。 受源地图比例尺约束，本数据库的空间分辨率（比例尺）限定为1:250,000或更小。