CSPAN Key Capitol Hill Hearings April 17, 2016
Through the 15th centuries. Welcome to the archaeological park. In the heyday, it was the largest city north of mexico. It contains the remains of about 30 flattop mounds. We are Still Standing at mound b. Thousandns about 1100 pounds of dirt. Originally, scientists thought they mounds were built by a basket load of dirt at a time. Recent Research Indicates that the base of the mound, and possibly the sides were initially built with sod which were then filled in with clay. This would give more s...
Source: archive.org