Cerro Uritorco and the Pajarillo Burn Mark (1986)

The reported event

On 9 January 1986, a dark, roughly circular mark appeared on Cerro El Pajarillo, a slope beside the Cerro Uritorco in the Sierras Chicas of Córdoba province. Reports say a local child had seen an object come down over the hill the night before, and the mark was discovered the following day. Accounts diverge on details: Wikipedia describes a dark circle about 100 metres across, while Cadena 3 gives a 122-metre "strange mark" that reportedly persisted for about three years. Local media and the Wikipedia UFO sightings in Argentina list present the mark as a landing trace, and it became known as the Huella del Pajarillo.

The mark is the only physical element in a story that otherwise rests on a single child's testimony. No primary investigation report from a military, scientific, or civil aviation body has been identified in the sources reviewed.

Competing explanations

Two alternative accounts circulated early. Cadena 3 reports unnamed "versions" that the mark was caused by a fire rather than a craft. A separate, more pointed claim appears in a 2025 podcast summary from El Colegio Invisible, which attributes to Luis Bartoli, then head of the local fire station, the assertion that some sightings and the mark were deliberately staged by local authorities to attract tourists. That claim is a second-hand summary of a podcast, not a verified interview, and it has not been independently corroborated. Taken together, the fire and staging accounts are plausible but unproven; the mark's origin remains undetermined in the public record.

Tourism and the UFO town

Whatever its origin, the episode reshaped the town. Wikipedia describes Capilla del Monte as nicknamed "UFO City," with shops selling alien-themed goods and an Alien Festival, first held in 2012 and staged most Februaries. The hill is privately administered and charges an entry fee. The same encyclopedia entry for Uritorco repeats the local belief that the mountain conceals an underground city inhabited by extraterrestrials, though that claim is tagged as lacking a citation.

Assessment

The Pajarillo mark is a useful case study in how a single ambiguous physical trace, a local legend, and tourism economics can fuse into a durable regional identity. Its evidentiary basis is thin: no named investigator, no measured sample, and no published analysis. Argentina's best-documented mass UFO event is the 1988 Villa Urquiza sighting, which is separate from this entry. Credibility is rated contested: the event is widely reported locally, but the landing claim is unverified and the staging allegation is unconfirmed.