The Black Hills region of South Dakota is prone to sinkholes, Jass said. Basically, water underground erodes its surroundings forming subterranean caves.

‘Coffee with a Cop’ is a monthly meeting open to anyone in KOTA Territory to keep them informed and invested in our community ...

Sinkholes are fairly common, due to collapsed caves, old mines or dissolving material but the circumstances in South Dakota stand out, said Paul Santi, a professor of geological engineering at the ...

This article was originally published with the title “ The Crystal Cave of South Dakota ” in SA Supplements Vol. 57 No. 1476supp (April 1904), p. 23657 doi:10. ...