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They resemble ordinary concretions in the following respects: in their external form, in the union of two or three, or of several, into an irregular mass, or into an even-sided layer, in the occasional intersection of one such layer by another, as in the case of chalk-flints, -in the presence of two or three kinds of nodules, often close together, in the same basis, in their fibrous, radiating structure, with occasional hollows in their centres, in the co-existence of a laminary, concretionary, and radiating structure, as is so well developed in the concretions of magnesian limestone, described by Professor Sedgwick.
It is doubtful whether these masses, which are of cylindrical form, parallelopipedons rounded on the edge, or balls of 40 to 50 feet in diameter, are the effect of a slow decomposition, or of a violent and instantaneous upheaving. The granite of the south-eastern part of Sierra Parime sometimes passes to pegmatite,* composed of laminary felspar, enclosed in curved masses of crystalline quartz.
I advised my companions to chew the laminary tangles, which they would find contained a saccharine juice, affording considerable relief to their parched lips and throats. The remainder of the day passed without incident.
I advised my companions to chew the laminary tangles, which they would find contained a saccharine juice, affording considerable relief to their parched lips and throats. The remainder of the day passed without incident.
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