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S
Sand
M
Mud
Cy
Clay
Si
Silt
St
Stones
G
Gravel
P
Pebbles
Cb
Cobbles
R
Rock, Rocky
Bo
Boulder(s)
Co
Coral
Sh
Shells
S/M
Two layers e.g. Sand over Mud
fS.M.Sh
Mixed: where the seabed comprises a mixture of materials, the main constituent is giver first, e.g. fine Sand with Mud and Shells

Weed (including Kelp)
Sg
Seagrass

Sandwaves

Spring in seabed

Area of sand and mud with patches of stones or gravel

Rocky area

Coral reef
f
Fine (only used in relation to sand)
m
Medium (only used in relation to sand)
c
Coarse (only used in relation to sand)
bk
Broken
sy
Sticky
so
Soft
sf
Stiff
v
Volcanic
ca
Calcareous
h
Hard