| 释义 |
bottomset beds
\ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷-\ noun plural
: layers of sedimentary material lying along the bottom of a body of water near the point of entry of a stream, the material having been carried to the area by the entering stream and being subsequently covered by foreset beds and topset beds in the formation of a delta |