The Mammoth Site of Hot Springs, South Dakota, Inc. is the largest accumulation of Columbian Mammoths discovered in their primary context in the world. The site was found in 1974, during excavation for a housing project. Over one million visitors from all over the world have come to see the bone remains of 48 Columbian and 3 Woolly mammoths, plus 25 species of other animals that lived together 26,000 years ago.
Geology of the Hot Springs quadrangle, Fall River and Custer Counties, South Dakota