Click on an image for more details Folded Permian and Tertiary rocks in Quebrada la Angostura, west of Frambal?, Northwest Argentina. Dr. Raul Seggiaro, of the Salta Delegation of Segemar, sitting on the angular unconformity between Ordovicion and Permian rocks. Filo Colorado, west of Antofagasta de la SIerra, Northwest Argentina. Sunset Southeast of Antofagasta de la Sierra, northwest Argentina. Canyon cut through Permian rocks. Filo Colorado, west of Antofagasta de la SIerra, Northwest Argentina. View west across Incahuasi valley to Calilaste belt, west of Antofagasta de la Sierra, Northwest Argentina. Field repair on the Puna west of Antofagasta de la Sierra, Northwest Argentina. Steep fault between altered Ordovicion rocks on right, and Permian rocks on left. In Filo Colorado, west of Antofagasta de la Sierra, Northwest Argentina. Thrust fault in Quebrada la Angostura, west of Frambal?, northwest Argentina. Grey rocks in upper cliffs are Ordovicion age, and red rocks in lower cliffs are Permian.