Olistostrome

An olistostrome is a sedimentary deposit composed of a chaotic mass of heterogeneous material, such as blocks and mud, known as olistoliths, that accumulates as a semifluid body by submarine gravity sliding or slumping of the unconsolidatedsediments. It is a mappable stratigraphic unit which lacks true bedding, but is intercalated amongst normal beddingsequences, as in the Cenozoicbasin of central Sicily. The term olistostrome is derived from the Greek olistomai (to slide) and stroma (accumulation).