Three flow units at Hole-in-the-Wall. Glacier National Park, Montana. 1982.
Dates
Date Taken
1982
Summary
Glacier National Park, Montana. Three flow units at Hole-in-the-Wall. Hammer rests at the contact between the lower two flow units. Pipe vesicles are visible extending up from near the base of the middle flow unit. Note the concentration of subspherical cavities in the upper part of the lower flow unit (below hammer). The upper and lower boundaries of nearly all flow units are easily discernable on the basis of pipes near the base and concentrations of subspherical cavities near the top. 1982. Figure 29, U.S. Geological Survey Open-File Report 85-543.
Summary
Glacier National Park, Montana. Three flow units at Hole-in-the-Wall. Hammer rests at the contact between the lower two flow units. Pipe vesicles are visible extending up from near the base of the middle flow unit. Note the concentration of subspherical cavities in the upper part of the lower flow unit (below hammer). The upper and lower boundaries of nearly all flow units are easily discernable on the basis of pipes near the base and concentrations of subspherical cavities near the top. 1982. Figure 29, U.S. Geological Survey Open-File Report 85-543.
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