Dotsero volcano (IMAGE) University at Buffalo Caption A view of the crater of Dotsero volcano, a monogenetic volcano that erupted in Colorado about 4,000 years ago. Credit Credit: Greg Valentine Usage Restrictions This image may only be used in news stories discussing the research in the related press release. License Original 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.