Geologisch-Paläontologisches Institut

Abstract:

The Ollantaytambo Formation is exposed extensively in the vicinity of the Inca archeological site of Ollantaytambo located in the Cordillera Oriental of southern Peru. This lithostratigraphic unit was first mentioned by Marocco (1978) who described the'Serie de Ollantaytambo'as a Cambrian to possibly Early Ordovician succession of quartzites, ignimbrites, tuffaceous, partly dark shales, and sandstones of at least 1000 m thickness. Until today no fossils were found in the rocks. To our knowledge the Ollantaytambo Formation represents the only evidence of syndepositional volcanic activity in the Early Paleozoic of the Cordillera Oriental of southern Peru and northern Bolivia. It is therefore of key significance for the interpretation of the plate tectonic evolution of the Early Paleozoic Gondwana margin in the northern Central Andes.

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