TrekGEO > Geology of Japan > Sedimentary facies > Lower shoreface

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Lower shoreface

Depth of water

6 - 7 meter depth - Fair-weather wave base (6 - 20 m)

Circumstances

Erosion and deposition by storm-weather waves are dominant much more than currents. Mud is removed fine sands are sorted by oscillatory flows generated by fair-weather waves. Longshore bars are eroded by storm-weather waves and sands are supplied.

Sedimentary facies (Sediments)

Fine sands graded well, and silt.

Sedimentary facies (Structures)

Hummocky cross-stratification formed by combination of oscillatory flows by storm-weather waves with bottom current toward ocean side. Paralle stratification.

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