A Geological Tour of Denver, Golden, and Colorado's Front Range

Pericles Press Home | Book | Contact Us/Ordering

A Theory | Seven Nations | Governments and Empires | Geological Past

The Idaho Springs Batholith

Gneiss and granite boulder along the Apex Trail

The Sentinel - Boulder standing guard near the start of the Apex Trail.

The Apex and Gregory Wagon Road

The Sentinel - Boulder near the start of the Apex Trail. The dark, upper part, is gneiss, the result of relatively fast cooling. The bottom part, closer to granite, is the result of slower cooling, which allowed the growth of larger grains and crystals.