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M. Gay El [illeg] Feb. 10. 1837

Coquimbo [crossed]

Argueros veins generally with Barytine & Witherite. – transition porphyry, absolutely identical with rocks of both worlds. – with cab: of Lime disseminated in veins of do.

amber of Cordillera granitic: before the traps & diorite passing beneath into syenite. El valley of Tilito more than 3500 metres. – Granite where covered by the transition rocks laced with dikes.

Greenstone-Porphyry covered by Rurite charged with Lime & many crystals of Pyroxene, which M. Gay thinks very odd confounding pyroxene & Amphibolic rocks. – Other times great veins of argillitic & Argillo porphyro, then vast formation of do, covered by Trachyte at height of 15. 249 feet Ery – Peaks of Donà anna 16. 399. – Between Tilito and

 

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Donà Anna, formation of Calcareo Jurassique with Oolite – Terebratula Plagiostomos Trigonias Ammonites – 14, 244 Feet going towards East Cuesta of D. Anna formation of Argillo porphyro.-

Baths of Tora grand analogy with those of Cauquenes. – Mur & Sulp of Soda.

? are there even Potent salts in Spring of Cordillera?