Field Guide to outcrops include:
The Cathey Formation is part of the Nashville Group of rocks, and is dated to the Late Ordovician Period.
A complex mixture of shaley limestone units. Tipically it is thin bedded, blue gray nodular limestone, interbedded with thin partings of sale and siltstone. Weathers to thin silty soil usually 3 to 4 feet thick. Outcrops extensively in Central Basin.
- H.R. Beaver,