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This field of lava is confined on both sides by the mountains of mica-schist, and slopes down rapidly but irregularly to the edge of the Pampas, where, having a thickness of about two hundred feet, it terminates against a little range of claystone porphyry.
Either it or the sea-breeze generally sets in between seven and eight a.m., when the stony, sandy world has been thoroughly sunned. The short divide beyond the far bank of the Sirr is strewn with glittering mica-schist that takes the forms of tree-trunks and rotten wood; and with dark purple-blue fragments of clay-slate looking as if they had been worked.
Petroleum gushes from mica-schist; and frightful detonations are heard at Encaramada, between the rivers Arauca and Cuchivero, in the midst of the granitic soil of the Orinoco and the Sierra Parima.
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