Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 1 - By Alexander Von Humboldt And Aime Bonpland.
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This Fossil Does Not Exhibit Those
Little Streaks Of Quartz So Common In The Lydian Stone.
It is found
decomposed at its surface into a yellowish grey crust, and it does
not act upon the magnet.
Its edges, a little translucid, give it
some resemblance to the hornstone, so common in secondary
limestones.* (* In Switzerland, the hornstone passing into common
jasper is found in kidney-stones, and in layers both in the Alpine
and Jura limestone, especially in the former.) It is remarkable
that we find the schistose jasper which in Europe characterizes the
transition rocks,* (The transition-limestone and schist.) in a
limestone having great analogy with that of Jura. In the study of
formations, which is the great end of geognosy, the knowledge
acquired in the old and new worlds should be made to furnish
reciprocal aid to each other. It appears that these black strata
are found also in the calcareous mountains of the island of
Boracha.* (* We saw some of it as ballast, in a fishing boat at
Punta Araya. Its fragments might have been mistaken for basalt.)
Another jasper, that known by the name of the Egyptian pebble, was
found by M. Bonpland near the Indian village of Curacatiche or
Curacaguitiche, fifteen leagues south of the Morro of Barcelona,
when, on our return from the Orinoco, we crossed the llanos, and
approached the mountains on the coast. This stone presented
yellowish concentric lines and bands, on a reddish brown ground. It
appeared to me that the round pieces of Egyptian jasper belonged
also to the Barcelona limestone.
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