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Much saline efflorescence about Rockas 70 miles W of Luxan

Mica slate at Barranquitos first mountain rock

NB Mole of B. Ayres mica slate! dip to SE ∠ 45.

El Morro full of mica slate 500 to 700 feet high perhaps [thinly] Traversia

R Quarto bed horizontal strata of dark red agglutinated sand.— P 92¹

Cliffs at river of S Lucia Alto del Yeso (Los Gigantes) 7 leagues broard strip of table land.— 304[-]222[=]82

Traversia salina (near banks of R. Negro) All Traversea between San Luis & Mendoza.— cliffs in R Tunuyan

At Barranqnitos first pebble of quartz.— going west.—

82 leagues. Mendoza to San Lucia

¹ Miers 1826, vol. 1, p. 92.

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Bushy or saline countries same: South of Cordova they exist

Mendoza 2600 feet.—

Uspallata plain below Paramillo & Andes. Elevation?—

I should think Luxan village south of Mendoza on river would show good section of 5 plains.—

Besides Traversia of Mendoza there are others of Rioja, Cordova St Jago Tucuman same characters San Luis? S Juan? P. 234.

The earth contains sulph. of soda St. Juan.—

P 250 — East of S Luis to Tucuman mica slate chain: Tucuman to Potosi clay slate.— where if joins Cordova (from Helms?)¹.—

¹ Miers 1826, vol. 1, pp. 234, 250. Miers referred to (without citation) Helms, A.Z. 1807. Travels from Buenos Ayres, by Potosi, to Lima, with notes by the translator, containing topographical descriptions of the Spanish possessions in South America, drawn from the last and best authorities; with two maps. London, 1806; 2d ed. London. Text