Main Shaft (IMAGE) University of Wisconsin-Madison Caption Crystals extracted from a rubble pile collected a century ago by prospectors at Meteor Crater showed extreme temperatures and pressures during the impact that created the crater 49,000 years ago. Credit Aaron Cavosie Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.