Figure F8. XRD profile of Sample 204-1244C-27X-1, 23-24 cm. This sample, from the volcanic glass-rich silt layer (Horizon B´) in lithostratigraphic Unit II, contains abundant amorphous silica (volcanic glass shards), which causes the bulge in the background peak levels.

Figure F8. XRD profile of Sample 204-1244C-27X-1, 23-24 cm. This sample, from the volcanic glass-rich silt layer (Horizon B´) in lithostratigraphic Unit II, contains abundant amorphous silica (volcanic glass shards), which causes the bulge in the background peak levels.