The Quarterly journal of the Geological Society of London . CO Vol. 54.] THE GEOLOGY OF FRAlfZ JOSEF LAND, 629 ice-slopes. We visited one of the bare plateau-surfaces, and foundit to be about g mile long and from 100 to 250 yards broad. Itwas covered with soil, and strewn with fragments of basalt, flint,ferruginous mudstone, and quartz. We also found a few small,well-rounded quartz-pebbles. The rock at the edge of the pltaeauwas composed of two, thin, almost horizontal sheets of basalt. At one spot on this island, where the rock is not exposed, wefound a hollow in the ice-slope which appeared
The Quarterly journal of the Geological Society of London . CO Vol. 54.] THE GEOLOGY OF FRAlfZ JOSEF LAND, 629 ice-slopes. We visited one of the bare plateau-surfaces, and foundit to be about g mile long and from 100 to 250 yards broad. Itwas covered with soil, and strewn with fragments of basalt, flint,ferruginous mudstone, and quartz. We also found a few small,well-rounded quartz-pebbles. The rock at the edge of the pltaeauwas composed of two, thin, almost horizontal sheets of basalt. At one spot on this island, where the rock is not exposed, wefound a hollow in the ice-slope which appeared to have originated Fig. 7.—Diagram to explain ice-hollow on Bruce Sea-level [The dotted portion represents a section on the ice-slope on each side, as we found it.] in the breaking away of an enormous mass of ice from the lowerside of a crevasse, which runs from 80 to 100 yards back from thecoast-line or general ice-face. Contrary to our expectation, wefound no rock or beach-material below the ice-crust forming thefloor of this hollow, but probably the true rock-face is not far behindthe vertical ice-wall at the back of the hollow. Fig. 7 may help thereader to understand ray necessarily imperfect description. Windward Island is a rocky mass rising to a height of 320 feet, and more or lesssurrounded by raised beaches from 80 to 100 feet above southern face of the rocks is much broken, but the northernand eastern faces show continuous cliffs of roughly columnar basalt(see fig. 6). The northern portion of the high ground is a plateau;but the southern portion, as will be seen from the figure, is brokenup into more or less peaked irregular
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
