And the boundary of them has the same lithologic character: the ravinement surface of river course or exposure mudstone of flooding plain and root clay.
二者的界面是相同的，均为河道砂体底部的冲刷侵蚀面或者是暴露过泛滥平原泥岩、根土岩等。
2
It is condensed section with shells, downlap surface and ravinement surface that constitute the critical boundaries in dividing the system tracts of Matuo Formation.
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