beach placer

(from the article `placer deposit`) Beach placers form on seashores where wave action and shore currents shift materials, the lighter more rapidly than the heavier, thus concentrating ... When wave trains impinge obliquely on a beach, a net flow of water, called a longshore drift, occurs parallel to the beach. Such a current can ... ...
Found on http://www.britannica.com/eb/a-z/b/35
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