noun
alluvial series
Geological term for a sequence of alluvial deposits. Used in stratigraphy and sedimentology.
この地域の沖積統は主に砂礫からなる。
The alluvial series in this area consists mainly of sand and gravel.
沖積層 refers to an alluvial deposit or layer, while 沖積統 is a broader stratigraphic unit encompassing a series of such deposits.
Compound of 沖積 (alluvial) and 統 (series, system). The exact historical derivation is uncertain; the spelling is conventionally associated with geological terminology.