A Textbook-Example of an Angular Unconformity

Angular unconformity between the Scaglia Bianca and Scaglia Rossa formations (marine rocks dating back to the Lower-Upper Cretaceous) and the continental rock of fluvial origin of the Pontegana Conglomerate, dating back to the Messinian. This discontinuity represents a fossil erosion surface, a gap in time, which separates the two episodes of rock sedimentation with a time interval of about 100 million years.

Credits: UAV-based survey and photogrammetry processing are provided by Fabio L. Bonali.

References

• Oppizzi, P., Pasquaré Mariotto, F., Stockar, R., Stella, A., Corti, N., Pedicini, M., … & Bonali, F. L. (2023). Geosites in the Gole della Breggia Geopark, Ticino, Southern Switzerland. Resources, 12(10), 122. Geosite (stop) n. 5.