ROCKY SHORES
This is the predominant type of coastline in Shetland. On exposed shores the constant pounding by the sea prevents the growth of seaweed and allows only hardy organisms like barnacles and limpets to survive. Rocky shores which are sheltered support the greatest diversity of seashore organisms tucked away in crevices, pools and overhangs.

SHINGLE SHORES
These beaches are a mixture of pebbles, their composition largely depending on the local geology, which are deposited according to size with the largest pebbles at the top of the shore. The shingle is moved around by the tides and a series of peaked ridges may be thrown up by storms. Many of the sand spits and bars around the coastline have a shingle base.

SANDY BEACHES
Varying in size, the sand mainly consists of finely ground up rocks and fragmented sea shells. The composition, structure and angle of slope is determined by wave action. Some beaches reflect the local geology such as the sparkling mica sands in Unst. The diversity of organisms on a sandy beach is largely determined by the size of the sand particles, smaller grains retaining most sea water at ebb tide. This enables a greater diversity of life to exist beneath the sand.

MUD FLATS
Mud flats form where fine particles of silt and mud accumulate on a level beach, often where fresh water enters the sea. High levels of organic material build up supporting large populations of invertebrates, an important food source for waders and shelduck.

SEASHORE SAFETY
1 Be aware of tide times and avoid being trapped by an
incoming tide.
2 Check the local weather forecast.
3 Be careful on slippery rocks, especially near the edge of the sea,
and watchful of incoming waves.
4 Keep well clear of cliff edges, especially in wet conditions.
S Do not touch any strange objects washed up on the shore as these may be dangerous. Any hazardous or suspicious items should be reported to the Coastguard or Police.
6 Please leave any bird corpses on or above the strand line as
these are counted monthly on some beaches.