The rock had a noticeable waffle pattern and had the appearance of the skin of a large reptile.
Ralph explained the rock was a fossilized imprint of a lepidodendron tree. It grew in great abundance in this area during the Carboniferous geologic period.
Fossils like this are often found near coal seams, which are plentiful in this part of Tennessee. Lepidodendron trees grew in marshes and swamps, which became ideal conditions for them to become pea. Over the course of hundreds of millions of years, geologic conditions put the peat under pressure, turning it into coal.
The scaly pattern of the lepidodendron trunk was mistaken by amateur geologists in the 19th century. They thought it was the fossils of giant lizards or snakes.
Continuing up the trail, we passed a sign identifying the location as Jury Ridge. The name might seem odd for this location unless you know what stands only a few miles from here. The former Brushy Mountain State Penitentiary, which was closed in 2009, was just beyond the boundary of the state park. It was a notorious prison that housed inmates for 113 years.
The most famous resident of Brushy Mountain was James Earl Ray, the man accused of assassinating Martin Luther King, Jr.