Impact craters.  Meteor crater (above) in Arizona is a ~1 km wide crater produced by the impact of a small meteor.  Manicouagan crater (below) , partially filled by a reservoir, in Quebec, Canada, was produced by the impact of a small asteroid or comet. Although the crater formed in the Late Triassic, its absolute age (214 Ma) means that the impact that produced the crater could not have caused the Triassic-Jurassic mass extinction.