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About the Cover

Cover Figure


COVER Assumed worm burrows in a 1.1-billion-year-old sandstone from central India. These trace fossils extend the record of animals to twice the age of the Cambrian evolutionary explosion. The burrows (~3 to 4 millimeters wide) were probably made in a shallow sea underneath a microbially bound surface mat, and weathering of the mat layer was necessary to reveal them. See page 80. [Photo: W. K. Sacco]

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Science. ISSN 0036-8075 (print), 1095-9203 (online)