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Available evidence suggests that dinosaurs in the San Juan Basin survived the event responsible for the creation of an iridium-enriched zone that has been discovered at or near the Cretaceous/Tertiary boundary at several locations throughout the world. The iridium zone has been found at two separate localities in the Raton Basin coincident with the palynologic Cretaceous/Tertiary boundary. The iridium zone has been searched for in the San Juan Basin at several localities where the palynologic Cretaceous/Tertiary boundary has been bracketed, but it has not been found. It is unlikely that the iridium zone will be found in the San Juan...

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