Back marsh

Circumstances

The outer part beyond fluvial levee in the flood plain. Fine sediments are supplied by flood water. It is covered with plants during the fair weather period.

Sedimentary facies (Sediments)

Mudstone and siltstone intercalating thin sandstone beds.

Sedimentary facies (Structures)

Planar cross-stratification.

Sedimentary facies (Fossils)

Carbonized plants and plant roots. No shellfish fossils and trace fossils are included.