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cyclic sediments
Cyclic sediments (also called rhythmic sediments) are sequences of sedimentary rocks that are characterised by repetitive patterns of different rock types (strata) within the sequence. Cyclic sediments can be identified as either autocyclic or allocyclic, and can be hundreds or even thousands of metres thick. The study of sequence stratigraphy was developed from controversies over the causes of cyclic sedimentation.
==Processes that create cyclic sediments==
Cyclic sedimentation occurs when there is a repetition of a specific series of connected events that affects the environment the sediments are deposited in. Changes in the environment of deposition change the type and amount of sediments that are deposited, resulting in different sedimentary rock types. A series of connected events produces a distinctive and repetitive series of strata that are arranged vertically. At least one rock type, which is regarded as the starting point, must be repeated.〔
Based on the processes that generate the cyclic deposits, two types of sedimentary cyclic successions — autocycles and allocycles — can be distinguished.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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