Discovery reports (1947) Discovery reports discoveryreports23inst Year: 1947 46 DISCOVERY REPORTS abruptly in sheer and inaccessible cliffs from 50 to 100 ft. higii which continue round the coast to the eastern side of the island. The rock is lava, at a distance dark in colour, and much broken with cracks and . .The island is remarkably free of snow and ice, and although snow may lie thinly on it after a heavy fall it does not remain for long. [This fact strongly suggests that there is still much residual heat in the cone, and that it may only be dormant.] Penguin Island is a volc
Discovery reports (1947) Discovery reports discoveryreports23inst Year: 1947 46 DISCOVERY REPORTS abruptly in sheer and inaccessible cliffs from 50 to 100 ft. higii which continue round the coast to the eastern side of the island. The rock is lava, at a distance dark in colour, and much broken with cracks and . .The island is remarkably free of snow and ice, and although snow may lie thinly on it after a heavy fall it does not remain for long. [This fact strongly suggests that there is still much residual heat in the cone, and that it may only be dormant.] Penguin Island is a volcanic cone in the shaping of which three, and perhaps four, periods of activity seem to have been involved. What seems to have been the earliest and biggest eruption is represented now by the concave section of a very large, but almost entirely cut away crater which occupies nearly the whole of the western face of the cone, from the shingle beach up to the summit. The degree of concavity is not very high, yet it is unmistakable. The sides of the interior of this now almost destroyed cone are composed of rather finely divided volcanic clinker of a rich brick-red colour which gives this side of the island its characteristic tint. The clinker fragments have the even consistency of a coarse gravel. Projecting out of this eroded crater, its base on a level with the beach, is a huge plug [? dike] of lava from three to five feet in width and rising vertically like a wall for nearly a hundred feet. Similar though less conspicuous plugs [dikes] occur elsewhere in this crater. Main summit crater. A later eruption is perhaps represented by this crater, a third of a mile across and about 200-300 ft. deep, which occupies the summit of the cone. Evidently the rim of this crater has crumbled away considerably, for it is highest to the north, but slopes downward towards the south (see sketch, Fig. 2). The bottom is rather damp and shows signs of there having been water lying about. On the east
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