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Seabed Type

Used by

Artefact

Description

A list of terms describing the composition of the seabed.  Some terms are derived from the Wentworth Scale of particle size.

Format

Simple wordlist

 

Term

Scope Note

Clay

Sediment particle size < 3.9 m

Silt

Sediment particle size 3.962.5 m

Fine sand

Sediment particle size 62.5250 m

Coa rs e sand

Sediment particle size 0.252 mm

Gravel

Sediment particle size 264 mm

Cobble

Sediment particle size 64256 mm

Boulder

Sediment particle size > 256 mm

Rock

Bedrock

Coral

Coral reef

Concretion

Concretion of iron oxide, sediments and cultural material

Shell

Shell and broken shell

Sea grass

Sea grass (Posidonia), usually on sand

Other

Another seabed type not listed above