Diluvium
（重定向自Deluvial）
![Diluvial terraces on Katun River Altai Scabland, Altai Republic](/Images/godic/202501/08/Устье_Чуи4521.jpg")
![Giant current ripples in the Kuray Basin, Altai, Russia](/Images/godic/202501/08/Рябь_течения4521.jpg")
![Diluvial terraces in Central Altay Mountains, Katun River, Little Yaloman Village. July 2011](/Images/godic/202501/08/Diluvial_bars_in_Central_Altay_Mountains_July_2011_by_Alexei_Rudoy4521.jpg")
Historically, Diluvium was a term in geology for superficial deposits formed by flood-like operations of water, and so contrasted with alluvium or alluvial deposits formed by slow and steady aqueous agencies. The term was formerly given to the boulder clay deposits, supposed to have been caused by the Noachian deluge.