New Impact crater (Introduction)

by David Turell , Tuesday, February 19, 2013, 15:08 (4086 days ago)

Another impact crater found in Iowa, from about 470 million years ago:-http://www.washingtonpost.com/national/health-science/crater-found-in-iowa-points-to-asteroid-break-up-470-million-years-ago/2013/02/18/545131f8-76d5-11e2-aa12-e6cf1d31106b_story.html?wpisrc=nl_headlines