Durdham Down, Quarry Steps (Triassic of the United Kingdom)

Also known as Redland, Derdham

Where: England, United Kingdom (51.5° N, 2.6° W: paleocoordinates 35.9° N, 0.8° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Magnesian Conglomerate Formation, Rhaetian (208.5 - 201.3 Ma)

• Late Triassic deposits infill Early Carboniferous (Dinantian) marine limestones

• bed-level stratigraphic resolution

Environment/lithology: fissure fill; limestone and dolomitic, yellow, sandy breccia

• "brecciated beds" within marine limestone are described as "conglomerate" and as "angular fragments of Carboniferous limestone in a matrix of yellow marl." Considered a "dolomitized cave breccia or fissure fill"

Size classes: macrofossils, mesofossils

Collected by J. S. Miller, Benton

Collection methods: bulk, salvage, quarrying, mechanical,

• Agrosaurus specimen was originally believed to have been collected from the NE coast of Australia by the H.M.S. Fly in 1844, but this was later shown to be in error, and these materials represent additional Thecodontosaurus specimens from Durdham Down.

Primary reference: W. Buckland. 1824. Reliquiæ Diluvianæ; or, Observations on the Organic Remains Contained in Caves, Fissures, and Diluvial Gravel, and on Other Geological Phenomena, Attesting the Action of an Universal Deluge. Second Edition. John Murray, London 1-303 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51970: authorized by Matthew Carrano, entered by Matthew Carrano on 07.07.2005, edited by Terri Cleary

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Euselachii -
? Hybodontiformes indet.2 Patterson 1966 elasmobranch
denticle
 Hybodontiformes - Lonchidiidae
Lissodus minimus2 Agassiz 1839 elasmobranch
tooth
 Synechodontiformes -
Rhomphaiodon minor2 Agassiz 1837 elasmobranch
subsidiary cusp of tooth
Actinopteri
 Actinopterygia -
"Actinopterygia indet." = Actinopteri2
"Actinopterygia indet." = Actinopteri2 Cope 1871
tooth
Reptilia
 Eosuchia -
Archosauromorpha indet.2 archosauromorph
BRSMG Cb4277.15, fragment of small tooth
 Archosauria -
Archosauria indet.8 archosaur
jaw fragments, caudal, scapulocoracoid
 Saurischia -
Thecodontosaurus antiquus n. sp.5 Morris 1843 saurischian
BRSMG *Ca7465/1, C4529/2; BRSMG Cb4195.2 and BRSMG Cb4196.4, fragments of single teeth from reference 57931
Asylosaurus yalensis n. gen. n. sp.3 Galton 2007 saurischian
YPM 2195, 56745, 56725, 56726, 56739; BMNH R1542
Anchisauria indet.3 Galton and Upchurch 2004 saurischian
BRSMG Ca7464/118, Cb4243, Cb4189/78, Ca7482/80, Ca7483/82, Cb4174c/41, Ca7451a/81, Ca7454/87, Ca7450/61, Ca7457c/63, Ca7460/57, Ca7560/60, Ca7490/71, Ca7492/69I, Ca7493/70, Ca7498/83; ANSP 9864, 9875, 9856; YPM 56724; BGS 907924; BMNH 49984c
Agrosaurus macgillivrayi n. gen. n. sp.7 Seeley 1891 prosauropod
BMNH 49984
Theropoda indet.3 theropod
BMNH R1549; BRSMG Ca7487c/85; tooth with BMNH 49984e; also BRSMG Cb4277, tibia, "Originally the fossil was identified as a rib and assigned to Thecodontosaurus antiquus by Huene" (from reference 57931)
 Ornithischia -
Ornithischia indet.3 ornithischian
BRSMG Ca7474/16b
 Herrerasauria -
? Herrerasauria indet.3 Galton 1985 archosaur
YPM 56744; BRSMG Ca7513/77b; BMNH R1539
 Loricata -
Sphenosuchia indet.2 crocodilian
BRSMG Cb4195, right femur, initially identified as 'Thecodontosaurus costa’ by Huene (1908)
 Phytosauria -
"Palaeosaurus cylindricum n. gen. n. sp." = Palaeosaurus cylindrodon6
"Palaeosaurus cylindricum n. gen. n. sp." = Palaeosaurus cylindrodon6 Riley and Stutchbury 1836 archosaur
tooth; BRSMG *Ca7449/4
 Phytosauria - Parasuchidae
"Phytosauridae indet." = Mystriosuchinae2
"Phytosauridae indet." = Mystriosuchinae2 von Huene 1915 archosaur
BRSMG Cb4261.1 and BRSMG Cb4196.5, two large teeth
 Phytosauria -
Rileya bristolensis n. sp.4 Huene 1902 archosaur
BRSMG *Ca7461/95, 96
Palaeosaurus platyodon n. sp.6 Riley and Stutchbury 1836 archosaur
tooth; BRSMG *Ca7448/3
 Eosuchia -
Lepidosauria indet.8 Haeckel 1866 lepidosaur
"lizard"; BRSMG Cb4715
 Rhynchocephalia - Clevosauridae
Clevosaurus sp.2 Swinton 1939 rhynchocephalian
BRSMG Cb4196.2, incomplete right ramus of lower jaw; BRSMG Cb4196.3, tooth
 Rhynchocephalia -
Diphydontosaurus avonis1 Whiteside 1986 rhynchocephalian
BMNH R14111; additional eighteen teeth and jaw fragments from reference 57931
Diphydontosaurus avonis3 Whiteside 1986 rhynchocephalian
BRSMG Cb4714
? Planocephalosaurus sp.2 Fraser 1982 rhynchocephalian
BRSMG Cb4213.2, acrodont tooth
 Eosuchia - Kuehneosauridae
? Kuehneosauridae indet.2 Romer 1966 crown diapsid
BRSMG Cb4196, rib: "Considering the archosauromorphs identified from the Durdham Down deposit, an alternative identification is as an ulna of Terrestrisuchus (Crush, 1984), which is of similar size and cross section, but the absence of epiphyses means that the decision between kuehneosaur rib or crocodylomorph ulna must be left open."