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.
Tallest Mountain Range in Arizona. The tallest of the peaks, Humphrey, soars to an elevation of over 12,600 feet. From a hundred miles away, you can see the San Francisco Peaks rising high above the pine forests below. The landmark icon backdrop of Flagstaff is comprised of three main peaks, Humphrey, Agassis and Fremont.