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] 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]
Vertebrate paleobiota
Turtles
Turtles reported from the Lulworth Formation[8] |
Genus |
Species |
Location |
Stratigraphic position |
Material |
Notes |
Images |
Dorsetochelys |
D. typocardium, D. delairi |
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|
Both species probably represent the same taxon[9] |
|
Helochelydra |
H. anglica |
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Hylaeochelys |
H. latiscutata |
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Pleurosternon |
P. bullocki |
|
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|
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Lepidosaurs
Lepidosaurs reported from the Lulworth Formation |
Genus |
Species |
Location |
Stratigraphic position |
Material |
Notes |
Images |
Becklesius |
Indeterminate |
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|
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Dorsetisaurus |
D. hebetidens, D. purbeckensis |
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Durotrigia |
D. triconidens |
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Homoeosaurus |
Indeterminate |
|
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Rhynchocephalian |
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Opisthias |
Indeterminate |
|
|
|
Rhynchocephalian |
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Paramacellodus |
P. oweni |
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|
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Parasaurillus |
P. pseudobtusus |
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Parviraptor |
P. estesi |
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Stem-snake |
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Pseudosaurillus |
P. becklesi |
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|
|
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Purbicella |
P. ragei |
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Saurillus |
S. robustidens |
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Dinosaurs
Dinosaurs reported from the Lulworth Formation |
Genus |
Species |
Location |
Stratigraphic position |
Material |
Notes |
Images |
Echinodon |
E. becklesii[10] |
Durlston Bay, Swanage[10] |
|
Jaw and teeth |
A small heterodontosaurid |
|
Owenodon |
O. hoggii[11] |
Durlston Bay, Swanage |
|
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|
|
Nuthetes |
N. destructor[12] |
Feather Quarry, Durlston Bay, Swanage |
|
Teeth and a bit of jaw |
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 |
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|
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|
Bolodon |
B. minor, B. crassidens, B. osborni, B. elongatus, B. falconeri |
Mammal Bed |
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Plagiaulacidae |
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Chunnelodon |
C. alopekodes |
Sunnydown Farm Quarry |
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|
|
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Ctenacodon |
C. minor |
Mammal Bed |
|
|
Allodontidae |
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Dorsetodon |
D. haysomi |
Sunnydown Farm Quarry |
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Paurodontidae |
|
Durlstotherium |
D. newmani |
Mammal Bed |
|
|
|
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Durlstodon |
D. ensomi |
Mammal Bed |
|
|
|
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Gerhardodon |
G. purbeckensis |
Sunnydown Farm Quarry |
|
|
Pinheirodontidae |
|
Kouriogenys |
K. minor |
Mammal Bed |
|
|
Peramuridae |
|
Magnimus |
M. ensomi |
Sunnydown Farm Quarry |
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|
|
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Peraiocynodon |
P. inexpectatus |
Mammal Bed |
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|
Docodontidae |
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Peramuroides |
P. tenuiscus |
Mammal Bed |
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Peramuridae |
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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 |
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|
Dryolestidae |
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Plagiaulax |
P. becklesii |
Mammal Bed |
|
|
Plagiaulacidae |
|
Purbeckodon |
P. batei |
Sunnydown Farm Quarry |
|
|
Morganucodonta |
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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 |
|
|
|
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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. (2004-11). "The turtles of the Purbeck Limestone Group of Dorset, southern England". Palaeontology. 47 (6): 1441–1467. doi:10.1111/j.0031-0239.2004.00418.x. ISSN 0031-0239.
- ↑ Pérez-García, A. (2014-05). "Revision of the poorly known Dorsetochelys typocardium, a relatively abundant pleurosternid turtle (Paracryptodira) in the Early Cretaceous of Europe". Cretaceous Research. 49: 152–162. doi:10.1016/j.cretres.2014.02.015. ISSN 0195-6671.
- 1 2 "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".