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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It Takes Successively The Names Of Sierra De Acha,
Sierra De Los Mimbres, Sierra Verde, And Sierra De Las Grullas,
And
about the 29 and 39 degrees of latitude, it is connected by spurs with
two lateral chains, those of
The Texas and La Sonora, which renders
the separation of the chains more imperfect than the trifurcations of
the Andes in South America.
That part of the Cordilleras of Mexico which is richest in silver beds
and veins, is comprehended between the parallels of Oaxaca and
Cosiquiriachi (latitude 16 1/2 to 29 degrees); the alluvial soil that
contains disseminated gold extends some degrees still further
northwards. It is a very striking phenomenon that the gold-washing of
Cinaloa and Sonora, like that of Barbacoas and Choco on the south and
north of the isthmus of Panama, is uniformly situated on the west of
the central chain, on the descent opposite the Pacific. The traces of
a still-burning volcanic fire which was no longer seen, on a length of
200 leagues, from Pasto and Popayan to the gulf of Nicoya (latitude 1
1/4 to 9 1/2 degrees), become very frequent on the western coast of
Guatimala (latitude 9 1/2 to 16 degrees); these traces of fire again
cease in the gneiss-granite mountains of Oaxaca, and re-appear,
perhaps for the last time, towards the north, in the central
Cordillera of Anahuac, between latitude 18 1/4 and 19 1/2 degrees,
where the volcanoes of Taxtla, Orizaba, Popocatepetl, Toluca, Jorullo
and Colima appear to be situated in a crevice* extending from
east-south-east to west-north-west, from one ocean to the other.
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