This area has remnants of a forest preserved in stone, that had been growing on the site before the upthrust of the Andes some 150 million years ago.

[3] About 150 million years ago, during the late Jurassic period, the area occupied by this national park had a stable climate with abundant moisture.

The site is of particular interest because it shows that the climate of this part of Patagonia was much wetter before the Andes intercepted the humid airflow from the west.

[1] The climate of the park is characterized as being cold, arid, and windy with large temperature swings between day and night.

[2] The vegetation in the park is mostly low spiny shrubs adapted for living in arid environments; these include Caesalpinia gilliesii, Berberis microphylla, Arthrophyllum rigidum, Chiliotrichum diffusum, Mulinum spinosum and Fragaria chiloensis.