|Coverage||UK and adjacent European waters|
|Format||GIS polygon data. (ESRI, MapInfo, others available by request)|
|Price||£0.003 per km2. Subject to number of users, licence fee and data preparation fee.
|View||A free WMS service is available for this dataset. Or view it through MAREMAP|
The 1:250 000 scale offshore geological maps in the UTM series (Universal Transverse Mercator projection) are available digitally as two themes: bedrock geology (BGS Geology: marine bedrock 250k) and sea-bed sediments (BGS Geology: marine sediments 250k).
The overlying column of sea-water imposes major limitations offshore that makes it impossible to use normal, onshore, geological mapping techniques. However, other techniques such as ship-board geophysical surveys can be used that allow geological interpretations using evidence not normally available onshore.
The sea-bed sediments theme is only mapped offshore, where it commonly forms a veneer on the sea bed.
The map is based on sea-bed grab samples of the top 0.1 m, combined with cores and dredge samples as available.
A standard Folk triangle classification has been used based on the gravel percentage and the sand to mud ratio.
Contact Digital Data for more information.