Iridium anomaly
Iridium anomaly
Thin layer of the element iridium in rock strata at the Cretaceous–Paleogene boundary.
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Chicxulub crater
Prehistoric impact crater in Mexico.
27%
Iridium
Chemical element with atomic number 77 (Ir).
12%
Tektite
Gravel-sized glass beads formed from meteorite impacts.
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Alvarez hypothesis
Asteroid impact hypothesis.
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Cretaceous–Paleogene boundary
Geological boundary between time periods.
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Shocked quartz
Form of the mineral quartz, found in nuclear test sites and meteor impact zones.
5.4%
Impact event
Collision of two astronomical objects.
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Eltanin impact
Prehistoric asteroid impact in southeast Pacific Ocean.
3.9%
Impact crater
Circular depression in a solid astronomical body formed by the impact of a smaller object.
3.2%
Extraterrestrial materials
Natural objects that originated in outer space.
2.8%
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