Fig. 2. Volcanic glass in the very fine sand (VFS) fraction of surface and subsurface horizons of soils derived from andesite across an elevation and climate gradient in the Sierra Nevada of California. Values for each elevation (biome) represent the following horizons: 2700 m (AL-7) A1 and AC; 2450 m (SA-6) A1 and AC2; 2150 m (RF-5) A1 and Bw2; 1700 m (WF-4) A1 and Bw1; 1150 m (PP-3) A and Bt1; 520 m (PO-2) A and Bt1; and 160 m (BO-1) A1 and Bw2.