Beta-Echo and Mystery (plus other canyons)
Ok, you probably already have the beta for Echo and Mystery, but just in case you don't, I added it to Summitpost:
http://www.summitpost.org/canyon/300...ry-canyon.html
http://www.summitpost.org/canyon/300...ho-canyon.html
Also, if anyone is interested in other (lesser known) slot canyons, here are several:
http://www.summitpost.org/area/range...o-plateau.html
See the left hand column of the page where it says "children" and "canyons". 12 canyons have been added.