洪こう積せき層そう

こ

う

せ

き

そ

う

Meanings

1

noun

diluvium; diluvial formation

geology

Geological term for Pleistocene deposits; now often replaced by 更新統 (こうしんとう) in modern stratigraphy, but still encountered in older literature and some contexts.

この地ち域いきの洪こう積せき層そうからは多おおくの化か石せきが発はっ見けんされている。
Many fossils have been discovered in the diluvial deposits of this region.

洪deluge, flood, vast
積volume, product (x*y), acreage
層stratum, social class, layer

Similar words

更こう新しん統とう
更新統 is the modern geological term for Pleistocene strata, while 洪積層 is an older synonym still used in some contexts.
沖ちゅう積せき層そう
沖積層 refers to alluvial deposits (Holocene), contrasting with the older Pleistocene 洪積層.

Etymology

From 洪 (flood, vast) + 積 (accumulate) + 層 (stratum), reflecting the early geological concept of a great flood depositing these layers. The term is now largely historical in geology.