A = Mt. Shasta was declared a National Natural Landmark in December 197(X). ((((X) – 3 = (A))))
B = About 59(Y),000 years ago andesitic lavas erupted in what is now Mount Shasta's western flank near McBride Spring. ((((Y) – 1 = (B))))
C = The first reliably-reported land sighting of Mount Shasta by a European or American was by Peter Skene Ogden in 1826. In 1827, the name "Sasty" or "Sastise" was given to nearby Mount McLoughlin by Ogden. The name was transferred to present-day Mount Shasta in 184(C).
D = The last historic eruption of Mount Shasta occurred in 178(D).
E = Mount Shasta is located at the southern end of the cascades in Siskiyou County, California at an elevation of 1(E),179 feet. It is the fifth highest mountain in California.
F = The first recorded ascent of Mount Shasta occurred in (F)854 (by Elias Pearce), after several earlier failed attempts.
(((Yeah it is a gimmie)))
N 38° 42.ABC / W 121° 11.DEF
You can check your answers for this puzzle on Geochecker.com.
Some other interesting facts about Mount Shasta:
Mount Shasta has an estimated volume of 85 cubic miles (350 km3) which makes it the most voluminous stratovolcano in the Cascade Volcanic Arc.
Mount Shasta is not connected to any nearby mountain. It rises abruptly and stands nearly 10,000 feet (3,000 m) above the surrounding terrain.
During the last 10,000 years Shasta has erupted an average of every 800 years but in the past 4,500 years the volcano has erupted an average of every 600 years. The last significant eruption on Shasta may have occurred 200 years ago.
According to local Indian tribes, Mount Shasta is inhabited by the spirit chief Skell who descended from heaven to the mountain's summit.
Theodore Roosevelt said about Mt. Shasta, "I consider the evening twilight on Mt. Shasta one of the grandest sights I have ever witnessed."
As always… Enjoy.