It is interesting to see a dig site with all those layers in the soil like in the second picture. About 30 minutes from where I live archaeologists have been working in a sink hole that had layers of different fossils from different time periods. It's crazy to see some of the history you can see from some sites. From what they found, there use to be red pandas, Saber-toothed cats, and more in Tennessee at one time. They also have a lot of Native American dig sites and they are just as interesting.