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Shale

Raindrops gently splattered pits into fine-grained sediment some 215 million years ago. Before the next storm erased the impressions, more sediment covered and preserved them.

Group: Sedimentary
Image Number: 97-36378
Catalog Number: 116035
Time Period: Triassic Period

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