1. Map showing quaternary and late tertiary terraces of the lower Bighorn River, Montana Yale Public content 1989. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Bighorn River Watershed (Wyo. and Mont.). Quaternary. and Tertiary.