Monthly Archives: July 2019

Not too long ago, I visited the San Pedro Mountains, which contain the oldest rocks exposed in the Jemez region. You can visit that post for a more detailed explanation of the geology of this area, but the short version is that the San Pedro mountains are a block of...Read more

This unit has interested me since I first learned about it, and I’ve visited it once before. Basanite is a somewhat rare and unusual igneous rock type, very low in silica and somewhat enriched in alkali metals. The Cieneguilla Basanite is the only basanite identified so far in the Jemez...Read more

For some time, Gary Stradling has wanted to find some good chunks of obsidian on which to practice his knapping skills. (Not to be confused with “napping”, at which we are both already skilled.) Raw obsidian suitable for toolmaking must of course come in chunks large enough to work with,...Read more