Table A

Evidence for Impact at the Big Five, Eocene-Oligocene, and Jurassic-Cretaceous Extinction Boundaries

Extinction boundary

Age (m.y.)

Evidence of impact

Crater?

Age (m.y.)

Size (km)

Eocene-Oligocene

33.7 ±0.5

Tektites, microtektites, shocked quartz, coesite

Popigai, Siberia; Chesapeake Bay, U.S.

35.7±0.2 35.5±0.6

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