June 21st 2014 On-the-Rocks Field Trip
Neoproterozoic to Ordovician: Front Range and Structure Near Colorado Springs By Ronald L. Parker, Senior Geologists, Task-Fronterra Geoscience, 700 17th Street, Suite 1700, Denver, Colorado, 80202 ron.parker@taskfronterra.com The longest day of the year was a perfect setting for the 2nd Rocky Mountain Association of Geologists On-TheRocks, field trip for the 2014 season. It was also a perfect day for the assembled group to have their collective minds blown by the enigmatic and thought provoking rocks on Continued on page 37 Âť
The group approaching an encounter with the Upper Lyons Formation (Permian) which forms the spires in the middle distance. The aeolian crossbeds of the Lyons are here turned upright by backthrusting out of an evolved triangle zone wedge. These monoliths are also deformed by movement along the Hidden Inn fault, which cuts obliquely across the dominantly N-S structural trend of the fore and backthrusts of the triangle zone.
Vol. 63, No. 12
36
December 2014