image: This image shows detail of the rhythmites, showing the repetitive fine sand and silt-clay layers. Note also the presence of small dropstones (top left of the coin). This image relates to a paper that appeared in the June 29, 2012, issue of Science, published by AAAS. The paper, by Ernesto Pecoits at the University of Alberta in Edmonton, AB, Canada, and colleagues was titled, "Bilaterian Burrows and Grazing Behavior at >585 Million Years Ago." view more
Credit: [Image courtesy of Ernesto Pecoits and Natalie Aubet]