Gravel Bar showing imbrication

Look closely at the flat rocks to see how they have been pushed on top of each other as shingles on a roof. "imbricate structure Isedl (im'-bri-cate) A sedimentary structure characterized by imbrication of pebbles all tilted in the same direction, with their flat sides commonly displaying an upstream dip. Syn: shingle structure (sed). " Glossary of Geology 5th Ed