Field Sampling of Black Shale Outcrop (image) University of California - Riverside Share Print E-Mail Caption This photo shows researchers doing field sampling of a pyrite-rich black shale outcrop in China. The weathering of such sediments, which contain sulfur originally buried from the ocean, transfers sulfur isotope signals to the ocean to be buried again in marine sediments. Credit Chu Research Group, Institute of Geology and Geophysics, Chinese Academy of Sciences. 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.