Sediment Types

R - Bedrock Outcrop Credit: Miles O. Hayes and Jacqueline Michel of Research Planning, Inc.

B - Boulder

Boulders measure more than 256 millimeters in diameter.

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

C - Cobble

Cobbles measure between 64 and 256 millimeters in diameter.

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

P - Pebble

Pebbles measure between 4 and 64 millimeters in diameter.

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

G - Granule

Granules measure between 2 and 4 millimeters in diameter.

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

S - Sand

Sand grains measure between 0.06 and 4 millimeters in diameter.

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

M - Mud

Mud can be composed of silt and/or clay.

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

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