Sediment Tubes (IMAGE) University of Minnesota Caption Civil engineering professor William Arnold, University of Minnesota, and his research team gathered sediment cores in meter-long tubes. Credit William Arnold / University of Minnesota Usage Restrictions With proper credit 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.