Beach Terrace or Paleo Lake Shore
(c) 2005 Andrew Alden, licensed to About.com, Inc. (fair use policy)
During the ice ages, lakes occupied most of the wide, flat valleys in the Basin and Range province of the American west. Today those basins are mostly dry, many of them desolate playas. But when the lakes existed, sediment from the land settled along the shorelines and created long, level beach terraces. Often several paleo-shoreline terraces appear on the basin's flanks, each one marking a former shoreline, or strandline. Also, sometimes the terraces are distorted, yielding information about tectonic movements since the time they formed.
Strandlines along the seacoast may have similar raised beaches or wave-cut platforms.
This beach terrace marks an ancient strandline of Summer Lake in south-central Oregon, the Oregon Outback. This picture is also available as a free wallpaper image.
Fossils
Geologic Features and Processes
Glaciers and Ice
Landforms
Minerals
Rocks
Geology and Society
