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Sandstone

Fountain Formation, Pennsylvanian Period. Sandstone is a sedimentary rock--one that formed from sediments deposited at Earth's surface by water, ice, or wind. The sand and pebbles that make up this sandstone are fragments from older rocks. The fragments were carried downhill by rivers and streams 300 million years ago, deposited in layers, then bound together by natural cement.

Group: Sedimentary
Image Number: 2002-11815
Catalog Number: 116619-6
Time Period: Pennsylvanian Period
Collected by Museum staff , 1994
Locality: Boulder , Colorado

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