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New petrological observations from a volcanic unit at the base of the Jurassic sequence in the Alta Guajira region (Colombia) are consistent with the presence of a continental volcanic arc and the development of an intra-arc basin in the area. Fault-bounded Jurassic sedimentary basins in the Alta Guajira region were initiated during the early Jurassic (180 Ma) with silicic volcanism in the axis of a magmatic arc and later filled with a thick volcano-sedimentary sequence. The Jurassic silicic volcanic rocks at the base of the basin (Riodacita de Ipapure–Cerro La Teta) are observed as isolated remnants of andesite, dacite,...

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