Impact event Chicxulub Crater. This crater is centered on the Yucatán Peninsula of Mexico and was discovered by Tony Camargo and Glen Pentfield while working as geophysicists for the Mexican oil company PEMEX. What they reported as a circular feature later turned out to be a crater estimated to be in diameter. This convinced the vast majority of scientists that this extinction resulted from a point event that is most probably an extraterrestrial impact and not from increased volcanism and climate change (which would spread its main effect over a much longer time period). Although there is now general agreement that there
Rochechouart crater Rochechouart crater The Rochechouart crater is an impact crater. The initial crater morphology has been lost by erosion and there is no crater visible on site. The proper term to designate what remains of the Rochechouart impact crater is Rochechouart impact structure. The term “astrobleme” (wound of star in greek) introduced by R. Dietz since 1947 together with shatter cones as a symptomatic finger print for identifying an eroded impact crater on Earth, is also used to designate the Rochechouart impact structure. In 2008 the French State acknowledged the heritage value of the Rochechouart impact creating the “Réserve Naturelle Nationale