Last updated: December 15, 2020
Stop 9: The Whitney-Gering Contact
- About 30 feet above the trail, the Gering Formation ends and the Whitney Member of the Brule Formation begins. The mineralology, grain size, texture, and regional mantling of the Whitney Member suggest that it was created through the slow accumulation of volcanic ash that blew in from the west.
To get to the next stop on the tour, head down the trail about 700 feet and look to the northeast towards Saddle Rock. Here you will see more of the Gering-Whitney contact.