Stratigraphic Unit No. PIT 2, unit b. Interpreted deposit type: tephra fall. Thickness: 5 cm. Grain size: coarse to medium lapilli. Bedding: massive. Sorting: well-sorted. Juvenile clast type: brown (less dense, slightly more vesicular clasts) and tan (pumice-like clasts, yet still poorly vesiculated). Remarks: 1953 Crater Peak tephra. Munsell color-wet: 5YR 2/2. Munsell color-dry: 5Y 6/1. Grain shape: angular. Age: 1953.
Characterization and discrimination of Holocene tephra-fall deposits, Mount Spurr volcano, Alaska
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