Portland Sand Formation | |
---|---|
Stratigraphic range: Tithonian, | |
Type | Group |
Unit of | Portland Group |
Underlies | Portland Stone Formation |
Overlies | Kimmeridge Clay Formation |
Thickness | up to 40 metres (130 ft) |
Lithology | |
Primary | Dolomite |
Other | Siltstone, limestone and sandstone |
Location | |
Region | England |
Country | ![]() |
Extent | Dorset |
Type section | |
Named for | Isle of Portland |
Location | Clay Ope, West Weare Cliff, Isle of Portland |
Thickness at type section | 30 m |
The Portland Sand Formation is a limestone formation from the Tithonian stage of the Jurassic period on the Isle of Portland, Dorset, England.[1] The formation is made up largely of dolomites but includes siltstones and fine-grained sandstones in its lower parts.[2] It is a sub unit of the Portland Group.[3]
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