Cretaceous–Paleogene boundary
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The Cretaceous–Paleogene boundary, formerly known as the Cretaceous–Tertiary boundary, is a geological signature, usually a thin band of rock containing much more iridium than other bands. Wikipedia
Age: 66.043 ± 0.011 Ma; Cretaceous–Paleogene boundary
Coordinates: 21°24′0″N 89°31′0″W / 21.40000°N 89.51667°W
Depth: 20 km (12 mi)