|Fill, recently emplaced during construction, usually reddish.|
|Weathered, light gray or buff colored clay.|
|Carbonaceous material, lignite.|
|Sandy, or sandy layers.|
|Varved or layered clay.|
|Reddish soil or subsoil, residual.|
|"Boulder" interrupting the progress of drilling.|
|Hole Terminated due to depth.|
|Hole terminated due to "Refusal"|
Colors suggest color of material penetrated.
Information provided by the Tennessee Department of Transportation, from on-site auger drilling logged by geologist Larry Bolt.