Depending on the environment of deposition, the time required for the deposition of a lamina may range from a fraction of a second to many years. However, for most granular cohesionless materials deposited by current action either as bed-load, or as combined bed-and-suspended load, it is probable that the formative period ranges from a few seconds to a few hours. An estimate of the number of laminae transected in an outcrop or section may provide a useful guide to the minimum time of formation of the deposit.

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