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.
Santa Catalina Mountain-Mount Lemmon-Rincon Mountains Mt. Lemmon is a rare jewel in the Arizona desert. Jutting up 9,000 feet above sea level, this magnificent mountain peak stands amidst the pale backdrop of the sparse desert sand and cactus.