Geology of the Pedersen Nunatak, Early Cretaceous, Antarctic Peninsula

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Rodolfo A. del Valle
Juan M. Lirio
Jorge H. Núñez


The Pedersen Formation (Late Hauterivian) beds forming part of the upper Mesozoic-lower Cenozoic Larsen Basin succession are affected by reverse faults and folds produced by transpressional forces acting normal to the Weddell Sea coast of the Antarctic Peninsula during mid-Cretaceous compression of the Larsen Basin. Eight sedimentary facies were identified in the 215 m-thick sedimentary succession exposed at Pedersen Nunatak, which is composed mainly of conglomeratic rocks with minor amounts of sandstones and mudstones, containing unidentifiable plant remains, and a marine fauna that includes belemnite phragmocones and ammonite fragments of the Favrella genus. This ammonite assigns a Late Hauterivian age to these deposits.

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del Valle, R. A., Lirio, J. M., & Núñez, J. H. (2007). Geology of the Pedersen Nunatak, Early Cretaceous, Antarctic Peninsula. Revista De La Asociación Geológica Argentina, 62(4), 506-520. Retrieved from

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