Beaver Street Wall — Attraction in San Francisco

If the word slickenside is not part of your everyday vocabulary, you must make it so immediately. The word is almost as awesome as the thing itself.

This is an amazing piece of geology right in the middle of San Francisco. More than a few years ago, this was deep underneath the Earth and part of the Corona Heights Fault. The diagonal lines show the direction of the fault slip. You can even see places where the sedimentary layers buckled. The wall is made of chert. In some places this wall is as slick and shiny as glass. A translucent layer of silica called silica gel, is what makes this wall so darn shiny. Apparently chart is filled with silica so the tremendous pressure and friction the fault movement transforms it into a glassy surface that coats the rock. Is that...

Interesting, these rock formations has been around for millions of years and undisturbed. It may happen in a geological formation from the San Andreas Fault probably? So that’s the reason why we have earthquakes...

Good little wall in a public park. Approach for setup is around the back. Bolts are cut/not maintained, so top rope only. I found it to be very smooth, so be careful with...