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| Description: Two types of sedimentary rock. Sandstones (left) consist of compacted grains of sand or minerals; shales (right) consist of ancient compacted clay or mud. Picture Stats: Views: 176 Filesize: 835.42kB Height: 1000 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=48574 |