BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Aerial photograph of Seceda, Dolomites, Italy. The west wall of Seceda tells geologists about the very early history of sedimentation in the Alps. The red sandstone dates back to the time 250 million years ago when the area was covered by a desert. The greyish layers developed at the bottom of the Alpine Tethys sea which later flooded this desert.
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