T Transgressive lag

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Transgressive lag

Synonym

Transgressive gravels, Transgressive sands, Ravinement surface, Ravinement erosion surface, Wave-ravinement surface

Depth of water

High tide - Ebb tide

Circumstances

Residual sediments remained on the erosional surface of the lower level strata which is formed by wave erosion in the stage of transgression.

Sedimentary facies (Sediments)

Poorly-sorted gravels and sands. Beach gravels, or sands of tidal channel. Relatively dominated in coarse sediments such as shells, calcareous nodules, and siliceous gravels.

Sedimentary facies (Structures)

Sediments of ravinement surface overlies with an erosion surface on the basement. Less than 50 cm thick.

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