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.
Highest Point: Humphrey's Peak at 12,637 feet (3,851 m) Lowest Point: Colorado River at 70 feet (22 m) Arizona is a state located in the southwestern United States. It became a part of the U.S. as the 48th state (the last of the contiguous states) to be admitted into the Union on February 14, 1912.