was once thought to be impact-related) may produce shock-like fused rocks called "frictionite". See also Earth Impact Database Gliese 710 – example of gravitational perturbations (in mega-year scale) of the Solar System Impact Field Studies Group Impact craters Impact events List of impact craters on Earth List of meteor air bursts Tollmann's bolide hypothesis Traces of Catastrophe, 1998 book from Lunar and Planetary Institute – comprehensive reference on impact crater science Notes and references Notes References Bibliography External links Earth Impact Database – List of confirmed earth impact sites at the Planetary and Space Science Centre, University of New Brunswick Impact Database (formerly Suspected Earth Impact Sites list) maintained by David Rajmon for Impact Field Studies Group, US + Lists of coordinates