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Nature of the Seabed

SNS a-e

Types of Seabed

Ref. IHO Symbology Description CHS Symbology
1
S
Sand
S       †   s
2
M
Mud
M       †   m
3
Cy
Clay
Cy       †   Cl       †   cl
4
Si
Silt
Si       †   Oz       †   oz
5
St
Stones
St       †   st
6
G
Gravel
G       †   g
7
P
Pebbles
P       †   peb
8
Cb
Cobbles
9.1
R
Rock, Rocky
R       †   r       †   Rk       †   Rky
†   Sn       †   shin
9.2
Bo
Boulders
Bo       †   B       †   b       †   Blds
10
Co
Coral and Coralline algae
Co †   crl
11
Sh
Shells (skeletal remains)
Sh       †   Oy       †   Oys       †   oys       †   sh       †   Ms       †   mus
12.1
S/M
Two layers, e.g. sand over mud
12.2
fS.M.Sh
fSMSh
Mixed qualities, e.g. fine sand with mud and shells
fSMSh
13.1
Wd
Weed (including kelp)
13.2
Kelp, weed
14
Sandwaves
15
Spring in seabed