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Marine animals--probably trilobites--scratched out furrows in the mud 500 million years ago. Sand filled in the furrows, and both eventually turned to rock. Cambrian Period.

Group: Sedimentary
Image Number: 2002-11808
Catalog Number: L706
Time Period: Cambrian Period
Loan from Department of Paleobiology


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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits