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.
Check out our list of things to do outdoors, as well our Calendar of Events. Flagstaff hosts one of only two ski resorts in Arizona. Mt. Humphreys reaching 12,637ft in elevation is Arizona's highest point and home to the Arizona Snowbowl Resort.