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.
1 The highest points at the Grand Canyon are found at Point Imperial on the North Rim, which is 8,803 feet high, and Navajo Point on the South Rim, which is 7,498 feet high. 2  Compare this to the elevation of the lowest point at Phantom Ranch on the bottom of the canyon floorâwhich is 2,400 feet high.