Middridge, Durham (Permian of the United Kingdom)

Also known as type locality of Adelosaurus huxleyi

Where: England, United Kingdom (54.6° N, 1.6° W: paleocoordinates 17.2° N, 14.5° E)

• coordinate stated in text

• hand sample-level geographic resolution

When: Marl Slate Formation (Zechstein Group), Wuchiapingian (259.9 - 254.2 Ma)

• the Marl Slate is the "first member of the English Zechstein succession" (Pettigrew, 1979) and equivalent to the Kupferschiefer of Germany. Brauns et al. (2003) reported a date of 257.3 +/- 2.6 Ma (Wuchiapingian) for the Kupferschiefer based on a Re-Os geochronological study. The presence of the conodont Mesogondolella britannica in Kupferschiefer equivalents supports a middle Wuchiapingian age.

•According to the British Geological Survey Lexicon of Named Rock Units (http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=MLSL) the Marl Slate has formational status and is a subunit of the Zechstein Group.

• bed-level stratigraphic resolution

Environment/lithology: coastal; claystone

• "Smith (1970, and pers. commn to Pettigrew) estimates that the Marl Slate in northern England was laid down some distance from the ancient shoreline, under fairly deep water. Pettigrew (1980, and pers. commn) has suggested that the Marl Slate may have been deposited closer to shore, in a shallow lagoonal facies. As the Zechstein Sea flooded the Lower Permian desert, lagoons may have been created around the base of the prominent dunes with the development of fringing vegetation in which the reptiles lived" (Evans, 1982)

Size class: macrofossils

Preservation: adpression

Collection methods: NEWHM = Hancock Museum, Newcastle upon Tyne

Primary reference: S. E. Evans. 1988. The Upper Permian Reptile Adelosaurus from Durham. Palaeontology 31(4):957-964 [J. Mueller/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 87004: authorized by Johannes Mueller, entered by Torsten Liebrecht on 27.02.2009, edited by Richard Butler

Creative Commons license: CC BY (attribution)

Taxonomic list

Lepidotosaurus duffi
Lepidotosaurus duffi n. gen. n. sp.2
Lepidotosaurus duffi n. gen. n. sp.2 Hancock and Howse 1870
Partial skeleton
 Eosuchia -
Protorosaurus speneri1 Meyer 1832 archosauromorph
NEWHM G.55.46
 Diapsida -
"Protorosaurus huxleyi n. sp." = Adelosaurus huxleyi
"Protorosaurus huxleyi n. sp." = Adelosaurus huxleyi Hancock and Howse 1870 diapsid
NEWHM G.26.49 (type)