Lulworth Formation
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- Worbarrow Tout Member
- Ridgway Member
- Mupe Member
| Lulworth Formation | |
|---|---|
| Stratigraphic range: Tithonian - Berriasian | |
 Lulworth Cove, an area where the Lulworth Formation is exposed | |
| Type | Formation |
| Unit of | Purbeck Group |
| Sub-units |
|
| Underlies | Durlston Formation |
| Overlies | Portland Stone Formation |
| Thickness | In Dorset 27-63 metres, In Weald 86 m Vale of Wardour up to 15m |
| Lithology | |
| Primary | Calcarenite, Micrite, Mudstone, Marl |
| Other | Gypsum |
| Location | |
| Region | England |
| Country | United Kingdom |
| Type section | |
| Named for | Lulworth |
| Location | West side of Worbarrow Tout |
The Lulworth Formation is a geologic formation in England. It dates from the late Tithonian to the mid Berriasian. It is a subunit of the Purbeck Group.[1] In Dorset, it consists of three members, which are in ascending order, the Mupe Member, the Ridgway Member, and the Warbarrow Tout Member. The Mupe Member is typically 11 to 16 m thick and largely consists of marls and micrites with interbeds of calcareous mudstone.[2] The Ridgeway Member is about 3 to 7 m thick and consists of in its western portion carbonaceous muds, marls and micrites, in the east the muds are replaced by micritic limestone.[3] The Warbarrow Tout Member is 17 to 39 m thick and consists of limestone at the base and micrite and mudstone for the rest of the sequence,[4] this member is the primary source of the vertebrate fossils within the formation.[5][6] Elsewhere the unit is undifferentiated.
