[1][2] Bridport Sand is of Toarcian (Early Jurassic) age and is found in the Worcester and Wessex Basins.

[3][4] The sandstone is very-fine grained to fine-grained and contains regular narrow bands that are calcite-cemented and more resistant to weathering, giving it a characteristic banded appearance at outcrop, such as in the cliffs between West Bay and Burton Bradstock in Dorset.

[6] The Bridport Sand Formation is known from exposures in Dorset, Somerset and Gloucestershire and from the subsurface in numerous boreholes.

This facies is found in the main part of the Wessex Basin where the formation is at its thickest.

The ferruginous facies consists of limestones cemented with goethite, ferroan calcite and dolomite.