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Sediment Types

Photo: Large rocks in surf.
Photo: Two people on a boulder-strewn shore.
Photo: Large rocks.
Photo of pebbles.
Photo of small rocks.
Photo of footprints on sand.
Photo of person crawling in deep mud.
Photo: Large rocks in surf.
R - Bedrock Outcrop Credit: Miles O. Hayes and Jacqueline Michel of Research Planning, Inc.
Photo: Two people on a boulder-strewn shore.
B - Boulder

Boulders measure more than 256 millimeters in diameter.

Credit: Miles O. Hayes and Jacqueline Michel of Research Planning, Inc.
Photo: Large rocks.
C - Cobble

Cobbles measure between 64 and 256 millimeters in diameter.

Credit: Miles O. Hayes and Jacqueline Michel of Research Planning, Inc.
Photo of pebbles.
P - Pebble

Pebbles measure between 4 and 64 millimeters in diameter.

Credit: Miles O. Hayes and Jacqueline Michel of Research Planning, Inc.
Photo of small rocks.
G - Granule

Granules measure between 2 and 4 millimeters in diameter.

Credit: Miles O. Hayes and Jacqueline Michel of Research Planning, Inc.
Photo of footprints on sand.
S - Sand

Sand grains measure between 0.06 and 4 millimeters in diameter.

Credit: Miles O. Hayes and Jacqueline Michel of Research Planning, Inc.
Photo of person crawling in deep mud.
M - Mud

Mud can be composed of silt and/or clay.

Credit: Miles O. Hayes and Jacqueline Michel of Research Planning, Inc.