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Text Description: Kaguyak Ignimbrite. light grey sandy ignimbrite; lower half includes a very lithic-rich horizon with large lithics; top of ignimbrite is PCZ; overlain by 20 m stratified pumiceous alluvium; ignimbrite is rich in degassing pipes; top of ignimbrite and the overlying sediments are rusty orange-brown stained and cemented by steam percolation. Exposed thickness 15 m. PCZ 1-2 m. LCZ:yes. See text for MP and ML. Pumice clasts: most are grey dacite; very minor scoria (analyzed black scoria is 63% SiO2). Lithic clasts: all lithics seen in the PCZ are dark grey crystal-rich dacite lava References:  Kaguyak dome field and its Holocene caldera, Alaska Peninsula |
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