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.
Humphreys Peak is Arizona's highest mountain. It is also the 26th most prominent mountain in the lower 48 states with an elevation rise of 6,053 feet. The 56 Ultra-Prominent U.S. peaks rise at least 4,921 feet (1,500 meters) above a nearby saddle or low point.