| * Particle sizes are defined in the graph on page 6 ----------> |
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Boulders: Larger than 25.6 cm Cobbles: 6.4 to 25.6 cm Pebbles: 0.2 to 6.4 cm Sand: 0.006 to 0.2 cm Silt: 0.0004 to 0.006 cm Clay: Less than 0.0004 cm |
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Conglomerate
Conglomerate is formed by the cementation of rounded particles including pebbles and possibly cobbles and boulders* in a mix of sand, silt and/or clay. The finer particles serve as a kind of glue or cement binding all of the larger particles together.
The larger particles in conglomerate are rounded which means they spent considerable time in the bed of a river or stream rolling around against one another. This process, called 'stream abrasion' gradually makes all the stones smaller, smoother, and rounder.
| * Particle sizes are defined in the graph on page 6 ----------> |
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Boulders: Larger than 25.6 cm Cobbles: 6.4 to 25.6 cm Pebbles: 0.2 to 6.4 cm Sand: 0.006 to 0.2 cm Silt: 0.0004 to 0.006 cm Clay: Less than 0.0004 cm |
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