. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. e Barne Glacier on the north, toHorseshoe Bay, a total distance of about 4 miles, the coast was examined by usin some detail, the area being near to our winter quarters, and the geological map(Plate XCV.) was constructed by us from a plane table survey. From the Cape Barne Glacier to Horseshoe Bay the coast-line is mostly formed ofbare kenyte lava. At our winter quarters at Cape Royds we were particularly for-tunate in having exposed to view a region intensely glac
. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. e Barne Glacier on the north, toHorseshoe Bay, a total distance of about 4 miles, the coast was examined by usin some detail, the area being near to our winter quarters, and the geological map(Plate XCV.) was constructed by us from a plane table survey. From the Cape Barne Glacier to Horseshoe Bay the coast-line is mostly formed ofbare kenyte lava. At our winter quarters at Cape Royds we were particularly for-tunate in having exposed to view a region intensely glaciated, which had formerlybeen buried to a depth of fully 1000 feet under the ice of the Ross Barrier. The region abounded in ice-eroded lake basins and tarns, as well as in largegrooves, like small canals cut by the ice out of the kenyte lava. A typical grooveis shown in Fig. 1 of Plate XXV. This canal-like groove measures in width about G to 8 feet, in depth about 5 feet. The granite erratic in the photograph measures 4 feet by 3 feet by 2 feet. PLATE XXIV Fiu. 1. CAPE BARNE GLACIERLooking south-eastwards towards Cape Evans. Fig. ?>. ICE CLIFF AT WEST END OF CAPE BARNE GLACIERWith Cape Barne in the distance. Cliff over 100 feet high [T. W. Edgeworth David[To face p. 108 CAPE BARNE 109 The height above sea-level is about 200 feet. The surface of the kenyte, ouaccount of the great absorption of heat by day and the rapid cooling at night,bringing about a quick disintegration of the rock through mechanical expansion andcontraction, has lost nearly all its former glacial striK through this frost weather-ing. Only in one instance were well-preserved grooves observed on the surfaceof a granite block, wedged into an angular hollow of the kenyte in such away that it still retained the direction of the grooves produced by the great icesheet when at its maximum. The light colour of the granite has led to its beingsubjected to less extiemes of temperature than the black kenyte, hence i
Size: 1243px × 2011px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, booksubjectgeology, booksubjectpaleontology
