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While advancing through the central area of National Marshes system, in Sinaloa, one can see what apparently is a hill, covered with weed and trees, but is really a hand made structure built completely of mollusk shells, 21.87 yards height, which base is 87,5 x 87,5 yards.
A midden, also known as a kitchen midden, is a dump for domestic waste. The word is of Scandinavian via Middle English derivation, but is used by archaeologists worldwide to describe any kind of feature containing waste products relating to day-to-day human life. They may be convenient, single-use pits created by nomadic groups or long-term, designated dumps used by sedentary communities that accumulate over several generations. In the latter case, a midden's stratigraphy can become apparent.
Midden deposits can contain a variety of archaeological material, including animal bone, feces, shell, botanical material, vermin, sherds, lithics (especially debitage), and other artifacts and ecofacts associated with past human occupation. These features, therefore, provide a useful resource for archaeologists who wish to study the diet and habits of past societies. Middens with damp, anaerobic conditions can even preserve organic remains which can be analyzed to obtain information regarding climate and seasonal use.