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.