. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. *L Fig. 1. PARASITIC TUFF CONE, CHIEFLY FORMED OF KENYTETUFF, NEAR CAPE BARNE. ^MA iL^i Fig. 2. PARASITIC CONE ON THE SLOPES OF MOUNT EREBUS [To face p. 222 HUT POINT 223 account for the presence of these numerous small erratics in the crater ? The heightof Crater Hill above sea-level is a little over 1000 feet. It has been described byH. T. Ferrar {op. cit., p. 12), where he mentions that the hill is formed of blackvesicular basalt and red scoriaceous basalt glass
. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. *L Fig. 1. PARASITIC TUFF CONE, CHIEFLY FORMED OF KENYTETUFF, NEAR CAPE BARNE. ^MA iL^i Fig. 2. PARASITIC CONE ON THE SLOPES OF MOUNT EREBUS [To face p. 222 HUT POINT 223 account for the presence of these numerous small erratics in the crater ? The heightof Crater Hill above sea-level is a little over 1000 feet. It has been described byH. T. Ferrar {op. cit., p. 12), where he mentions that the hill is formed of blackvesicular basalt and red scoriaceous basalt glass. As we have seen from the evidenceat Cape Royds, the basalts are amongst the newest of the lavas of Ross following explanations may be offered of this apparently contradictoryphenomena of the unglaciated state of the crater rim combined with the presenceof glacial erratics within the crater :— 1. The crater is post-glacial in the sense of its post-dating a maximum glaciation,and the presence of the glacier erratics in the crater may be explained by theerratics having been brought into their present position by floating ice dm-ing aperiod of submergence. This would demand a far greater sub
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Keywords: ., boo, bookcentury1900, booksubjectgeology, booksubjectpaleontology
