Relief shown by spot heights.
Coverage includes Northern Ireland.
"Derived from the Geological Survey of Ireland 1:100,000 Bedrock Map series and the Geological survey of Northern Ireland 1:250,000 Geological map of Northern Ireland."
National grid.
Includes notes, bedrock cross-section, space-time diagram for Precambrian and Lower Palaeozoic strata, diagram of 1:100,000-scale geological sheet coverage, and National Grid diagram.