Lulworth Formation
Lulworth Formation | |
---|---|
Stratigraphic range: Tithonian - Berriasian 152–139 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
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.
Vertebrate paleobiota
Amphibians
Amphibians reported from the Lulworth Formation[7] | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Apricosiren | A. ensomi | Worbarrow Tout Member | Salamander | |||
Celtedens | C. megacephalus | Worbarrow Tout Member | Albanerpetontid | |||
Sunnybatrachus | S. purbeckensis | Worbarrow Tout Member | Frog, affinites to Discoglossidae | |||
?Batrachosauroididae | Indeterminate | Worbarrow Tout Member | Salamander |
Turtles
Turtles reported from the Lulworth Formation[8] | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Dorsetochelys | D. typocardium, D. delairi | Both species probably represent the same taxon[9] | ||||
Helochelydra | H. anglica | |||||
Hylaeochelys | H. latiscutata | |||||
Pleurosternon | P. bullocki |
Lepidosaurs
Lepidosaurs reported from the Lulworth Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Becklesius | Indeterminate | |||||
Dorsetisaurus | D. hebetidens, D. purbeckensis | |||||
Durotrigia | D. triconidens | |||||
Homoeosaurus | Indeterminate | Rhynchocephalian | ||||
Opisthias | Indeterminate | Rhynchocephalian | ||||
Paramacellodus | P. oweni | |||||
Parasaurillus | P. pseudobtusus | |||||
Parviraptor | P. estesi | Stem-snake | ||||
Pseudosaurillus | P. becklesi | |||||
Purbicella | P. ragei | |||||
Saurillus | S. robustidens |
Crocodyliformes
Crocodyliformes reported from the Lulworth Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
cf. Bernissartia | Indeterminate | Teeth | ||||
Goniopholis | Indeterminate | |||||
Nannosuchus | N. gracilidens | |||||
Theriosuchus | T. pusillus |
Dinosaurs
Dinosaurs reported from the Lulworth Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Echinodon | E. becklesii[10] | Durlston Bay, Swanage[10] | Teeth and dentary | A small heterodontosaurid | ||
Owenodon | O. hoggii[11] | Durlston Bay, Swanage | Partial dentary | An iguanodontoid | ||
Nuthetes | N. destructor[12] | Feather Quarry, Durlston Bay, Swanage | Teeth, dentary fragment | Small dromaeosaur |
Mammals
Mammals reported from the Lulworth Formation | ||||||
---|---|---|---|---|---|---|
Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
Albionbaatar | A. denisae | Sunnydown Farm Quarry | Albionbaataridae | |||
Amblotherium | A. pusillum, A. soricinum, A. nanum | Mammal Bed | ||||
Bolodon | B. minor, B. crassidens, B. osborni, B. elongatus, B. falconeri | Mammal Bed | Plagiaulacidae | |||
Chunnelodon | C. alopekodes | Sunnydown Farm Quarry | ||||
Ctenacodon | C. minor | Mammal Bed | Allodontidae | |||
Dorsetodon | D. haysomi | Sunnydown Farm Quarry | Paurodontidae | |||
Durlstotherium | D. newmani | Mammal Bed | ||||
Durlstodon | D. ensomi | Mammal Bed | ||||
Gerhardodon | G. purbeckensis | Sunnydown Farm Quarry | Pinheirodontidae | |||
Kouriogenys | K. minor | Mammal Bed | Peramuridae | |||
Magnimus | M. ensomi | Sunnydown Farm Quarry | ||||
Peraiocynodon | P. inexpectatus | Mammal Bed | Docodontidae | |||
Peramuroides | P. tenuiscus | Mammal Bed | Peramuridae | |||
Peramus | P. tenuirostris, P. dubius, P. minor | Mammal Bed | Peramuridae | |||
Peraspalax | P. talpoides | Mammal Bed, Sunnydown Farm Quarry | Dryolestidae | |||
Phascolestes | P. mustelula | Mammal Bed, Sunnydown Farm Quarry | Dryolestidae | |||
Plagiaulax | P. becklesii | Mammal Bed | Plagiaulacidae | |||
Purbeckodon | P. batei | Sunnydown Farm Quarry | Morganucodonta | |||
Spalacotherium | S. tricuspidens, S. evansae, S. hookeri | Mammal Bed, Sunnydown Farm Quarry | Spalacotheriidae | |||
Sunnyodon | S. notleyi | Sunnydown Farm Quarry | Paulchoffatiidae | |||
Thereuodon | T. taraktes | Sunnydown Farm Quarry | ||||
Tinodon | T. micron | Sunnydown Farm Quarry | Tinodontidae | |||
Triconodon | T. mordax | Mammal Bed, Sunnydown Farm Quarry | ||||
Trioracodon | T. bisulcus, T. major, T. oweni | Mammal Bed, Feather Quarry |
See also
References
- ^ "Lulworth Formation". BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 28 August 2018.
- ^ "Mupe Member". BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 28 August 2018.
- ^ "Ridgeway Member". BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 28 August 2018.
- ^ "Warbarrow Tout Member". BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 28 August 2018.
- ^ "Sunnydown Farm Quarry (clay: upper horizon; equivalent to DB 102/103 )". Paleobiology Database. Retrieved 28 August 2018.
- ^ "Mammal Bed, Durlston Bay (DB83)". Paleobiology Database. Retrieved 28 August 2018.
- ^ Evans, Susan E.; McGowan, Gerard J. (2002). "Lissamphibian remains from the Purbeck Limestone Group, southern England". Special Papers in Palaeontology: 104–119.
- ^ Milner, Andrew R. (November 2004). "The turtles of the Purbeck Limestone Group of Dorset, southern England" (PDF). Palaeontology. 47 (6): 1441–1467. Bibcode:2004Palgy..47.1441M. doi:10.1111/j.0031-0239.2004.00418.x. ISSN 0031-0239.
- ^ Pérez-García, A. (May 2014). "Revision of the poorly known Dorsetochelys typocardium, a relatively abundant pleurosternid turtle (Paracryptodira) in the Early Cretaceous of Europe". Cretaceous Research. 49: 152–162. Bibcode:2014CrRes..49..152P. doi:10.1016/j.cretres.2014.02.015. ISSN 0195-6671.
- ^ a b "Type specimen: BMNH 48209, 48210, a mandible. Its type locality is cliff face, Durlston Bay, which is in a Berriasian fluvial-lacustrine limestone in the Lulworth Formation of the United Kingdom". fossilworks.org.
- ^ "Type specimen: BMNH R2998. Its type locality is Durlston Bay, Swanage (DB105-107), which is in a Berriasian marine limestone in the Lulworth Formation of the United Kingdom".
- ^ "Type specimen: DORCM G913, a mandible. Its type locality is Feather Quarry, Durlston Bay (DB102), which is in a Berriasian marine shale in the Lulworth Formation of the United Kingdom".
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