Subdivisions. The Ordovician is the second period of the Paleozoic era. The Ordovician began after the end of a series of extinction events known as the Ordovician-Silurian extinction events which ended around 488 mya.
As a state highpointer, Humphrey's Peak in Arizona was on my bucket list. The trailhead was easy to find. The trail itself was not well maintained and rather rocky, which wasn't too bad going up, but required a lot of caution descending to protect your knees.
All trails are open from sunrise to sunset daily, and there is no charge to hike in city parks. From highest to lowest, these are the Seven Summits of Phoenix. Camelback Mountain. At 2,704 feet, Camelback Mountain is the Mount Everest of the Valley, its summit offering one of the premier views in Arizona.