. --^*"^4, ''^'':c'' N â A .M. Fig. 7- by the sea, of which the inner diameter is about 8 km. Holtedahl believes, however, that it is not a single large crater, but a volcanic ring mountain built around a caldera subsidence bounded by a circular fault or series of faults. Dr Mackintosh collected material from the cliffs and slopes on the south-east side of the whaler's anchorage near the entrance to Deception Harbour. These form a narrow ridge of land separating the anchorage from Bransfield Strait (see Dr Mackintosh's sketches. Fig. 7). He reports that the whole of the cliffs shown in th
. --^*"^4, ''^'':c'' N â A .M. Fig. 7- by the sea, of which the inner diameter is about 8 km. Holtedahl believes, however, that it is not a single large crater, but a volcanic ring mountain built around a caldera subsidence bounded by a circular fault or series of faults. Dr Mackintosh collected material from the cliffs and slopes on the south-east side of the whaler's anchorage near the entrance to Deception Harbour. These form a narrow ridge of land separating the anchorage from Bransfield Strait (see Dr Mackintosh's sketches. Fig. 7). He reports that the whole of the cliffs shown in the sketch, except beyond Neptune's Bellows,^ consist of an 'agglomerate of ashes in a yellowish matrix'. It is possible that the yellow colour is mainly superficial, as freshly broken surfaces generally seem darker. The slopes below the cliffs are mainly of a soft gravel obviously formed from the disintegrated agglomerate, carrying a fair proportion of solid boulders of agglomerate, and here and there boulders of a harder dark rock presumably derived from intrusions in the agglo- merate (andesitic basalt). 1 Apparently the name given to the entrance channel of Deception Harbour.
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
