Julie Brigham-Grette and Pavel Minyuk, University of Massachusetts at Amherst (image) University of Massachusetts at Amherst Share Print E-Mail Caption These are co-lead scientists Julie Brigham-Grette and Pavel Minyuk with core. The two scientists celebrated when drilling reached the bottom of lake sediments at a depth of 318m below the lake bottom. At that point, drilling began reaching into the 3.6-million-year-old impact rock. Credit Courtesy of Tim Martin Usage Restrictions None Share Print E-Mail 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.