[38]

Helm's English Edit —

{Cordova mountains, veins of lead & silver, red granite

Immediately W. of Tucuman metals abundant.—

p. 24 During journey to Tucuman we found the mountains composed of primitive granite but as we proceeded the granite became interspersed with argillaceous slate of various colours; that however, which chiefly predominates in the Cordillera, is of a bluish cast as far at least as we had opportunity of examining them. Strata of Limestone & large masses of ferrugineous sandstone, are in many places superincumbent on the argillaceous slate. We likewise found on the road coal gypsum or rock salt

[38v]

the last ever on the summits of the most elevated ridges."—

Rosario to Concha blue argillaceous slate in mountains.

al Salto entered real Cordillera leaving lower mountains.

Hunnaguara indications of beds of salt as at before near Salta Tula

Argillaceous slaty mountains round Mojos.

p 48.— incidentally mentioned light new lochs running in a direction nearly N & S.

Near Potosi talks great rounded

masses of granite p. 45 & again beyond do p. 55. alluvium, of

[38a]

do with granite in situ at la Lenna

He says from Tucuman to Potosi argillaceous schistus.—

Argillaceous slate appears very abundant beyond Potosi

Beyond La Lenna sandstone on slate interspersed with granite

77

Anton Zacharias Helms. 1807. Travels from Buenos Ayres, by Potosi, to Lima, with notes by the translator, etc. London. Printed for R. Phillips. Text Anton Zacharias Helms (1751-1803) German mining director in Peru 1788-92. EH88202333