Doc Searls Weblog

That’s a shot of the Lava Falls section of the Grand Canyon. It’s one of my favorite scenes: of lava from the Uinkaret Lava Field slopping down into the canyon over the north rim. Atop Lava Falls itself is Vulcan’s Throne, a volcanic vent about 73,000 years old.

This may seem old, but the lava is among the newest features of the Grand Canyon. The Kaibab Limestone over which the lava flowed was laid down in early Permian time, around 290 million years ago. All the rocks below are older, on down to the Vishnu group at the bottom of the canyon, around 1.7 billion years ancient.

That set is one of many that came out of my most recent trip out west by plane. I’m in London now, and still getting them up.