How Has Life Changed over Geologic Time?
ES3002  Predicting Fossils
This layer of rock is made of sandstone. The pattern of curved, roughly parallel lines is called cross bedding. This pattern results when sand blown by wind is deposited in dune formations. The cross bedding indicates that dunes were once present at this location.

  !   Move your cursor over the image to highlight the cross bedding.
Martin Miller, University of Oregon
Navajo Sandstone in Zion National Park, Utah.
3. What type of fossils would you expect to find in an environment with sand dunes? 


	

 	

		
			
	

	
	

		 
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