Papago Park in Phoenix is home to a number of scenic rock formations
-- Hole in the Rock is one. A short trail leads up through it into a
cave-like opening, about 5 feet (~1.5m) high, which provides a good view of the valley and
downtown. The rock formation is a / of
age, and the next view shows it up close. Even in
this view, you can see angular chunks of (~1.7 billion year old) ,
which are visible throughout. This cave is an example of "". Next View >>
