|Coverage||UK and adjacent European waters|
|Format||GIS polygon data (ESRI, MapInfo, others available by request)|
|Price||£0.006 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 bedrock geology theme offshore is essentially the same as that mapped onshore, but it is usually much less detailed.
Onshore, a lithostratigraphical nomenclature is used with rocks routinely mapped at formation, member and bed level. Offshore, this is often impossible and rocks are commonly referred to by age. Where it is possible, mapping is usually only to group or formation level at best, and even these may not be differentiated into individual units, but shown only as part of a package of units.
Contact Digital Data for more information.