Chapter 1 Geology was everywhere and Dr. Ruby Stone was glad to have the knowledge to understand the environment she was in. The stair-stepped topography of the Glen Rose Formation in northwest Austin, Texas, made for a laborious climb. The alternating hard limestone and soft mud/sand layers had been deposited due to regression/progression series of near shore and off-shore environments during the Cretaceous – about sixty million years ago. Ruby’s short legs did not help.