The bedrock of this area. In a 1915 Kentucky Geological Survey publication, three formations were presented for the Louisville area. The deep formation was described as the Saluda limestone. The name came from Saluda Creek near Hanover, Indiana. The formation overlying the Saluda formation was presented as the Brassfield formation. The name came from the town of Brassfield, Kentucky. The uppermost of the formations was described as the Osgood formation. The name came from the town of Osgood, Indiana. The Louisville area has a firm foundation under the community. The foundation is based on three formations.
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