In Missouri, there is an old historic bridge that needed to have some repairs made to it.
Anytime that there is a project like this that requires digging into the earth the state sends out Larry Grantham, an archaeologist, to survey the land for historical sites.
He not only found one, but two sites of historical significance.
One site is thought to be 1,500 years old, the other could be anywhere from 3,000-5,000 years old.
The sites were unearthed only 3 feet below the surface of the ground.
Given the differing time periods of the sites, their findings at each have been dramatically different.
Among the artifacts the archaeologists have turned up are projectile points, drills and other tools, all made from chert, a type of rock found along the Mississippi River.