Home
Volcanoes
Webcams
News
Explore Data
Images
Get Involved
About AVO

Sample: 87-ARh-29

Sample ID: 87-ARh-29 [1]
Station ID: 87-ARh-29
AT Num:
Volcano: Sanford
Possible source:
Eruption:
Collector: Richter, D. H.
Date sampled: 1987-00-00
Sample type 1: Lava
Color:
Final unit:
Text Description: Mount Sanford older volcanic rocks (Pleistocene). Chiefly a sequence of interlayered thick lava flows, flow breccia, and debris and mudflow deposits that are mostly of andesitic of basaltic andesite composition; locally palagonitized. The few samples that were collected from unit are microporphyritic to porphyritic olivine basaltic andesite. * * * Flows and breccias are locally separated from overlying Sanford lava flows (Qsl) by slight angular unconformity. Source or sources unknown; maximum thickness about 450 m, but base not exposed.
Sample Location:

References Cited

[1] Geologic map of the Gulkana A-1 Quadrangle, south-central Alaska, 1994

Richter, D. H., Duffield, W. A., Sawyer, D. A., Schmoll, H. R., and Ratte, J. C., 1994, Geologic map of the Gulkana A-1 Quadrangle, south-central Alaska: U.S. Geological Survey Geological Quadrangle Map GQ 1728, unpaged, 1 sheet, scale 1:63,360.