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These questions are very interesting in the study of the relative antiquity of rocks, which is the principal basis of geology. I know not of any salt-deposits in the Llanos.
The fable of the Quivira, the golden city marked now by the ruins of the Piro pueblo of Tabiri, south of the salt-deposits of the Manzano, is still potent in Arizona and New Mexico to lure the treasure-seeker. Three hundred and fifty years ago it inspired a march across the plains that dwarfs the famous march of the Greeks to the sea.
Relations between ancient orifices of eruption and subsequent axes of injection. Iquique, Peru, fossils of, salt-deposits. Metalliferous veins. Summary on the porphyritic conglomerate and gypseous formations. Great subsidence with partial elevations during the cretaceo-oolitic period. On the elevation and structure of the Cordillera. Recapitulation on the tertiary series.
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