whilst other scales generally cover exposures on land only.

Sheets of all scales (though not for all areas) fall into two categories:

# Superficial deposit maps (previously known as solid and drift maps) show both bedrock and the deposits on top of it.
# Bedrock maps (previously known as solid maps) show the underlying rock, without superficial deposits.

The maps are superimposed over a topographic map base produced by Ordnance Survey

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