Crossing the Andes

While the Beagle was completing its missions of surveys along the coast of Chile, Darwin made a geological excursion looping across the Andes and back, making one of the first serious geological studies of the range. The southern portion of the loop remains territory for adventure.

Here I am pointing out my location on Darwin’s geologic cross section across the Andes.

Crossing the Tunuyan River with our guide.

Descending from the Paso de Piuquennes, keeping our eyes open for fossils.