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 638 AQUEOUS EROSION IN PALMA. [Ch. XXIX. gravel formed, to be afterwards cut through to a depth of 800 feet ? The ravine through which the torrent now flows has been excavated to that depth through the old conglomerate. The occurrence of two or three layers of contemporaneous lava, intercalated between the strata of puddingstone, ought not to surprise us; for even in historical times eruptions have been witnessed in
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 638 AQUEOUS EROSION IN PALMA. [Ch. XXIX. gravel formed, to be afterwards cut through to a depth of 800 feet ? The ravine through which the torrent now flows has been excavated to that depth through the old conglomerate. The occurrence of two or three layers of contemporaneous lava, intercalated between the strata of puddingstone, ought not to surprise us; for even in historical times eruptions have been witnessed in the southern half of Palma. Such basaltic lavas, one of them columnar in structure, had not come down from the Caldera, but from cones much nearer the sea, and immediately- adjoining the Barranco, like the cone of Argual (see map, p. 629) and others. These lavas, of the same age as the conglomerate, consist of three or four currents of limited extent, for in many parts of the river- cliffs no volcanic formation is visible on either bank. On the right bank of the Barranco, the conglomerate, when traced westward, is soon found to come to an end as it abuts against the lofty precipice e (fig. Fig. TOO. West. East.
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