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unpublished data sources, contains a personal geodatabase and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.