Eeeek! I didn't ride last Tuesday! Heaven forbid I have a weekday off the bike, but we couldn't fit it in. We were on our way to the Tingey Family Reunion in Lake Tahoe but did our requisite overnight stay in Mammoth.
We drove straight to the "Geologic Wonder" Devils Postpile. This is one of the best places in the WORLD to see Basalt Columnar Jointing. I took some geology courses while getting my degree in Geography & I have an interest, but not a deep knowledge of rocks. The entire drive up the eastern side of the Sierra Nevada's is full of geologic wonder. We always take along my book "Geology Underfoot" and try to visit a few sites.
Beautiful Columnar Jointing