Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 3 - By Alexander Von Humboldt And Aime Bonpland.
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The Co-Ordinate Layers Of Gem-Salt,
Muriatiferous Clay And Gypsum Present The Same Difficulties In Both
Hemispheres; These Masses, The Forms Of Which Are Very Irregular,
Everywhere Exhibit Traces Of Great Commotions.
They are scarcely ever
covered by independent formations; and after having been long
believed, in Europe, that gem-salt
Was exclusively peculiar to Alpine
and transition limestone, it is now still more generally admitted,
either from reasoning founded on analogy or from suppositions on the
prolongation of the strata, that the true location of gem-salt is
found in variegated sandstone (buntersandstein). Sometimes gem-salt
appears to oscillate between variegated sandstone and muschelkalk.
I made two excursions on the peninsula of Araya. In the first I was
inclined to consider the muriatiferous clay as subordinate to the
conglomerate (evidently of tertiary formation) of the Barigon and of
the mountain of the castle of Cumana, because a little to the north of
that castle I had found shelves of hardened clay containing lamellar
gypsum inclosed in the tertiary strata. I believed that the
muriatiferous clay might alternate with the calcareous conglomerate of
Barigon; and near the fishermen's huts situated opposite Macanao,
conglomerate rocks appeared to me to pierce through the strata of
clay. During a second excursion to Maniquarez and the aluminiferous
slates of Chaparuparu, the connexion between tertiary strata and
bituminous clay seemed to me somewhat problematical. I examined more
particularly the Penas Negras near the Cerro de la Vela,
east-south-east of the ruined castle of Araya.
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