Published November 14, 2014 at 500 × 329 in Ancient shellfish remains rewrite 10,000-year history of El Niño cycles The middens are ancient dumping sites that typically contain a mix of mollusk shells, fish and bird bones, ceramics, cloth, charcoal, maize and other plants. Image credit: M. Carre / Univ. of Montpellier (Visited 7 times, 1 visits today)