DigSBS250

DigSBS250 sample.

DigSBS250 coverage.

Scale 1:250 000
Coverage UK and adjacent European waters
Format GIS polygon data. (ESRI, MapInfo, others available by request)
Price £0.003 per km2. Subject to licence fee and data preparation fee.
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The 1:250 000 scale offshore geological maps in the UTM series (Universal Transverse Mercator projection) are available digitally as two themes: bedrock geology (DigRock250) and sea-bed sediments (DigSBS250).

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.

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Contact Digital Data for more information.

Hutton field: well correlation diagram.