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Bridport Sand Formation
From Wikipedia, the free encyclopedia
The Bridport Sand Formation is a formation of Toarcian (Early Jurassic) age found in the Worcester and Wessex Basins of central and southern England.[1][2] It forms one of the reservoir units in the Wytch Farm oilfield in Dorset.[3] 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 Bridport and Burton Bradstock in Dorset.[4] It is named for Bridport and has previously been known as the Midford Sand(s), Cotteswold Sands, Yeovil Sands and Upper Lias Sand(s).[1] It forms a locally important aquifer, particularly around Yeovil.[2]
Quick Facts Type, Unit of ...
Bridport Sand Formation | |
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Stratigraphic range: Toarcian | |
![]() Cliffs of Bridport Sand between Bridport and Burton Bradstock | |
Type | Geological formation |
Unit of | Lias Group |
Sub-units | Down Cliff Clay Member |
Underlies | Inferior Oolite Group |
Overlies | Beacon Limestone Formation or Whitby Mudstone Formation |
Area | Wessex Basin, Worcester Basin |
Thickness | Approx. 120 m |
Lithology | |
Primary | Sand, Silt Sandstone |
Other | Clay |
Location | |
Country | England |
Type section | |
Named for | Bridport |
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