Caelum Incognitum — The interactive encyclopedia of ufology

Physical trace

Objects & phenomena

A mark left in the environment by an alleged phenomenon: a circle of burned or flattened vegetation, imprints, altered soil. Investigators sample and analyze such traces. GEIPAN, for instance, studied the Trans-en-Provence trace (1981). Analyses often point to mundane causes, but some remain debated.

In the major cases

• Trans-en-Provence (1981)
• The Valensole Incident (1965)
• The Tully "Saucer Nest" (1966)
• The Delphos Ring (1971)
• The Dechmont Law Incident (1979)
• The Pretoria UFO (1965)

See also

• Close encounter of the second kind (CE2)
• GEIPAN
• Physiological effects
• Ring and luminous crown
• Maurice Masse (1918-2004)
• Ted Phillips
• Crop circles
• “Saucer nest”
• Angel hair

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