sedimentary rock

Cultural Dictionary
sedimentary rock [(sed-uh-men-tuh-ree)]

Rock that has formed through the deposition and solidification of sediment, especially sediment transported by water (rivers, lakes, and oceans), ice (glaciers), and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils.

Note: Limestone and shale are common sedimentary rocks.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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WordNet
sedimentary rock

noun
rock formed from consolidated clay sediments 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Sedimentary rock is always a great word to know.
So is gobo. Does it mean:
a gadget; dingus; thingumbob.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
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