hike on a Boulder Open Space and Mountain Parks trail, the
most apparent feature you see is the rock under your feet.
Trails running east-west cross millions of years of geologic
time and record many ancient environments, incuding the
uplift and wearing away of the 300 million year old
Ancestral Rocky Mountains, document when Colorado was
submerbed under an inland sea, and record the uplift of the
present Rocky Mountains about 70 million years ago. These
events are easily viewed in the rocks along the trails.
Three illustrated, self-paced, self-guided hikes cover three
trails: Marshall Mesa in south Boulder, NCAR Trail in the
center, and the Kiln Trail in north Boulder All are designed
for the non-geologist and describe the geologic history and
how to recognize the different environments. There is a
verbal description of the locations and GPS designation.