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Many of the exposures of detachment faults associated with the opening of the Tethyan ocean that we observed are moderately affected by Alpine deformation, so that pre-Alpine structures are preserved, but they may be folded or faulted in an Alpine overprint. One of the biggest challenges we faced during our Alps trip was the identification of these Alpine structures. Bobbie and Mike wanted us to try our hand at sorting out pre-Alpine structures and Alpine structures, so we broke up into groups of 2, and set off mapping for about 4 hours, documenting our observations in our notebooks, sketching outcrops and structural relationships, all with the final goal of making a structural “cross-section” column through the area, and creating a schematic cross-section through the area. Our mapping area was located in the Platta nappe, where oceanic rocks are more abundant. |
Looking north, near Falotta: the mapping project area.
 Foliated ophicalcites in the mapping area |
 Carbonate-cemented fault breccia with clasts of ophicalcite and serpentinite. |