Editing Cenote (section)

==Chicxulub crater==
[[File:Yucatan chix crater.jpg|thumb|Radar topography reveals the {{convert|180|km|abbr=on}} ring of the crater; clustered around the crater's trough are numerous [[sinkhole]]s, suggesting a prehistoric [[oceanic basin]] in the depression left by the impact (Image courtesy NASA/JPL-Caltech).]]

Although cenotes are found widely throughout much of the Yucatán Peninsula, a higher-density circular alignment of cenotes overlies the measured rim of the [[Chicxulub crater]]. This crater structure, identified from the alignment of cenotes,<ref name="Pope1996"/> but also subsequently mapped using geophysical methods (including [[Gravity anomaly|gravity mapping]]) and also drilled into with core recovery, has been dated to the boundary between the [[Cretaceous]] and [[Paleogene]] geologic periods, 66 million years ago. This meteorite impact at the [[Cretaceous–Paleogene boundary]] is therefore associated with the mass extinction of the non-avian dinosaurs and is also known as the [[Cretaceous–Paleogene extinction event]].<ref name="Bottke2007"/>