Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 642 ISLAND OF ST. PAUL. [Ch. XXIX Hartung and I, when in Palrna, came to the conclusion that the waves of the sea had never reached the Caldera, although they may have penetrated for some distance into the Barranco de las Angustias, and may have overflowed the space now overspread by certain strata of conglomerate to the east of the Barranco. Since the cessation of volcanic action in the north of Palrna, the most fr
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 642 ISLAND OF ST. PAUL. [Ch. XXIX Hartung and I, when in Palrna, came to the conclusion that the waves of the sea had never reached the Caldera, although they may have penetrated for some distance into the Barranco de las Angustias, and may have overflowed the space now overspread by certain strata of conglomerate to the east of the Barranco. Since the cessation of volcanic action in the north of Palrna, the most frequent eruptions appear to have taken place in a line running north and south, from a to Fuencaliente, map, p. 628 ; one of the volcanoes in this range, called Verigojo, g, being no less than 6565 English feet high. The lavas descending from several vents in this chain reach the sea both on the east and west coast, and are many of them nearly as naked and barren of vegetation as when they first flowed. The tendency in volcanic vents to assume a linear arrange- ment, as seen in the volcanoes of the Andes and Java on a grand scale, is exemplified by the cones and craters of this small range in Palma. It has been conjectured that such linearity in the direction of superficial outbreaks is connected with deep fissures in the earth's crust communicating with a subjacent focus of subterranean heat. By discussing at so much length the question whether the sea may or may not have played an important part in enlarging the Caldera Tiff. 701. jSfine-pin Kock. Entrance nearly dry at low water. Map of the Island of St. Paul, in the Indian Ocean, lat. 8S° 44' S., long. 77° 37' E., surveyed by Capt. Blackwood, E. 1ST., 1842. of Palma, I have been desirous at least to show how many facts and observations are required to explain the structure and configuration
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