cally continuous mass beneath. Wherever a crevassed tract was exhibited in section in a tidal cliff, the crevasses were seen to terminate uniformly along a definite zone, which was usually nearer the top of the cliff than its base. The depth of this zone was estimated in different instances at from… … FIG. 95. CREVASSES AND SERACS, MUIR GLACIER. their faces, the rate being greatest above, and the flat tops of the ice blocks, the seracs of alpinists (fig. 95), are converted into roof-like crests and pinnacles. In this condition the surface is nearly or quite impassable (fig. 96). With continuance…
Natural history -- Alaska · Scientific expeditions · Alaska
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