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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Between Nueva Barcelona and the Cerro del Bergantin a quartzose
sandstone covers the Jura limestone of Cumanacoa.
Is it an arenaceous
rock analogous to green sandstone, or does it belong to the sandstone
of Cocollar? In the latter case its presence seems to prove still more
clearly that the limestones of Cumanacoa and Caripe are only two parts
of the same system, alternating with sandstone, sometimes quartzose,
sometimes slaty.
10. GYPSUM OF THE LLANOS OF VENEZUELA.
Deposits of lamellar gypsum, containing numerous strata of marl, are
found in patches on the steppes of Caracas and Barcelona; for
instance, in the table-land of San Diego, between Ortiz and the Mesa
de Paja; and near the mission of Cachipo. They appeared to me to cover
the Jura limestone of Tisnao, which is analogous to that of Caripe,
where we find it mixed with masses of fibrous gypsum. I have not given
the name formation either to the sandstone of the Orinoco, of
Cocollar, of Bergantin or to the gypsum of the Llanos, because nothing
as yet proves the independence of those arenaceous and gypsous soils.
I think it will one day be ascertained that the gypsum of the Llanos
covers not only the Jura limestone of the Llanos, but that it is
sometimes enclosed in it like the gypsum of the Golfo Triste on the
east of the Alpine limestone of Cumanacoa. The great masses of sulphur
found in the layers, almost entirely clayey, of the steppes (at
Guayuta, valley of San Bonifacio, Buen Pastor, confluence of the Rio
Pao with the Orinoco) may possibly belong to the marl of the gypsum of
Ortiz.
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