|
Text Description: Stratified section includes: (a) 5-7 m of massive blue-grey mud with scattered pumice, mud extends below creek level; (b) 60 cm of crystal-rich sand, stained orange-brown, with abundant tiny lithics and sparse pumice granules; © 1.5 m of stratified-lenticular pumice-rich layers; (d) 1.5 m light grey pumice-bearing debris flow at top (~5% pumice clasts, ~50% lithic clasts in massive to vaguely layered silt to coarse sand matrix. No primary ignimbrite seen. Exposed thickness ~10 m. See text for MP and ML. Pumice clasts: (a) pumice in mud is white dacite pumice. Lithic clasts: Lithics in debris flow include abundant Jn (2:1 Jn to lavas), including river cobbles. References: ![]() |
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.