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A few leagues southward of these two places, on each side of the low primary range of S. Juan, there are some flat-topped, cliff-bounded, separate little hills, very similar to those fringing the primary ranges in the great plain south of Buenos Ayres: they are composed- -1st, of calcareous tuff with many particles of quartz, sometimes passing into a coarse conglomerate; 2nd, of a stone undistinguishable on the closest inspection from the compacter varieties of tosca-rock; and 3rd, of semi-crystalline limestone, including nodules of agate: these three varieties pass insensibly into each other, and as they form the uppermost stratum in this district, I believe that they, also, are the equivalents of the pure crystalline limestone, and of the red and white sandstones and conglomerates.
The ranges on the left side of the river extended several miles farther, but gradually sunk into a level country. W. B. Clarke, F.G.S. This rock consists of a semi-crystalline, greyish-brown marble, very like some varieties of Wenlock limestone. The most conspicuous fossil is a coral, which appears to belong to the family of Cyathophyllidae.
"It was faith, the highest faith," said Bessie proudly, and looking into my eyes with her old saucy dash, "to know, to feel sure, that that sealed paper concerned nobody but me." And so she has ever since maintained. A nodule of amygdaloid, a coarse pebble enveloped in a whitish semi-crystalline paste, lies on the table before me.
During also the deposition of these strata, we have in the intercalated layers of red Pampean-like mud and tosca-rock, and in the passage near S. Juan of the semi-crystalline limestones with agate into tosca undistinguishable from that of the Pampas, evidence of the same action, though continued only at intervals and in a feeble manner.
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