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Victoria University Antarctic Research Expedition Science and Logistics Reports 1969-70: VUWAE 14

(f) Hut Point Peninsula

(f) Hut Point Peninsula

Two days were spent investigating rock outcrops to the north of Scott Base. Cole and Ewart (1968) completed a survey of the geology of Cape Bird, Black Island and Brown Peninsula, and to complete this work along the west side of McMurdo Sound we examined the geology of Castlerock and the outcrops to the north, along the central portion of Hut Point Peninsula. Wellman (1964) has previously studied the surficial geology of the area. Castlerock is composed of a complex autoclastic palagonite breccia, which is presumed to have formed in the throat of a volcano, and it has later been intruded by a small dyke. Most of the other cones were basaltic, with some craters displaying fine examples of once molten volcanic bombs. A new outcrop of trachyte was located, and a breccia similar to that composing Castlerock was found to the south page 22 behind McMurdo. The famous sponge spicule balls were still located in this region (Wellman 1963). It is hoped that this sampling of volcanic rocks together with those from Capes Barne, Royds, and Crozier, and White Island can be combined to complete the regional reconnaissance of the volcanics.