Our soils vary all around Flagstaff from different volcanic stuff to sedimentary sandstone or limestone. Elden is mostly crushed dacite with a decent layer of organic on top. The current project that I’ve been working on for the last three years has some really unique geology and the 6 mile descent will be dropping through the dacite, Kiabab limestone and then around 800 vertical feet of red rock sandstone before reverting back to the dacite. It’s really freaking sweet and the views are awesome.