File:Tar Sandstone California.jpg

Summary
Description English: Tar sandstone from the Monterey Formation of Miocene age (10 to 12 million years old), of southern California, USA. Date	27 February 2013 Source	http://www.flickr.com/photos/jsjgeology/8512480279/sizes/o/in/photostream/ Author	James St. John (jsj1771) http://www.flickr.com/people/jsjgeology/ https://commons.wikimedia.org/wiki/File:Tar_Sandstone_California.jpg