Bedrock N250
The map data is mainly based on the nationwide printed bedrock geology map series at a scale of 1:250,000, and has since been harmonised across map sheet boundaries and updated with newer map data. Source: Placepoint. Included in Placepoint's map layer for Geology.
How the dataset appears on the map
The dataset is part of the Geology map layer. The screenshot, sub-layers and what a click on the map shows are described under Bedrock N250.

Update frequency: when the source changes.