Solar System Collisions - Online calculator for effects of asteroid impact. Meteor Crater - Official site for the visitors center at the Barringer meteor crater. Short history, animations, visitor information. Terrestrial Impact Craters - Text describing formation of impact craters. Images, glossary. Reuben Johnson's K/T Expedition -- 2001 - Background info on the Chicxulub impact crater at the K/T (Cretaceous/Tertiary) boundary with photos of the 2001 NASA/Planetary Society expedition to Belize and Mexico to study and gather ejecta samples. Meteor Crater - Images and short explanations of geologic features near the rim of the Barringer meteor crater. Geology 376 - 2001 Field Trip - Travelogue of a geology class field trip to the Barringer meteor crater. Images, crater description, topographic map. Terrestrial Impact Craters - Background information, images, list of craters, references. Impact Structures - Geology, geophysics, and petrology of impact structures (meteorite impact craters) with special focus on the Azuara and Rubielos de la Cérida impact structures (Spain) Traces of Catastrophe - Online book. Detailed introduction and overview of impact processes, crater formation, and shock metamorphism. Terrestrial Impact Cratering and Its Environmental Effects - World map of impact sites, details on the Chicxulub site, and details on environmental effects of impacts. The Chiemgau impact - Geographic, geologic, geophysical, mineralogical-petrographic, geochemical, astronomical and historical characteristics of a Holocene notable asteroid/comet impact and the role of the discovery in the scientific discussion. Impact Parameters - Online calculator for cratering effects of hypothetical asteroid impacts. Astronomy Picture of the Day - Barringer Crater on Earth - Aerial photograph. Astronomy Picture of the Day - Manicouagan Impact Crater on Earth - Image taken from space shuttle Columbia in 1983. Astronomy Picture of the Day - Impact: 65 Million Years Ago - Computer rendering of Chicxulub crater, from gravity and magnetic field data. Earth Impact Database - Crater names, location, size, and age. Background information, images, FAQ.