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Updated: May 1, 2025
I was now in a rude and barren country, presenting a strong contrast to the soft scenery I had left, and consisting of an elevated mountain plateau, or table land of slate of the Greywacke sort, the heights on the eastern side of the Rhine being of the same level, and the channel of the river appearing as a narrow valley, which the eye overlooks entirely.
I do not know whether this formation, which is not frequent in the south of Europe, has hitherto been discovered in other parts of Spain. Angular fragments of Lydian stone, scattered along the valleys, seemed to indicate that the transition schist is the basis of the strata of greywacke. Near Corunna even granitic ridges stretch as far as Cape Ortegal.
Applying these facts to natural productions, we have reason to believe that clay-slate, and many kinds of greywacke, are amorphous feldspar, as transition limestone is amorphous marble, basalt and lava mixtures of amorphous zeolite and augite. Anything that influences the cohesion, must also in a certain degree alter the properties of bodies.
Before sunrise we reached the summit of a narrow ridge, trending East-South-East 1/2 a mile east, from where the boats were lying: in this singular ridge I again noticed the dip to the south-east: it was composed of a variety of rocks, jasper, a greyish kind of flinty indifferent limestone, and greywacke.
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