Priestweston Quarry (Ordovician of the United Kingdom)

Also known as locality 27; Priest Weston

Where: England, United Kingdom (52.6° N, 3.0° W: paleocoordinates 58.4° S, 18.2° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Didymograptus murchisoni graptolite zone, Weston Flags Formation, Abereiddian (466.0 - 460.9 Ma)

• "Weston Member, Middleton Formation, Upper Llanvirn Series, Didymograptus murchisoni Biozone [...] " (Evans, 1992). These beds are now named the Weston Flags Fm. and are of Abereiddian age, according to the British Gelological Survey Lexicon of Named Rock Units (http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=WSN) and Evans (2005).

• group of beds-level stratigraphic resolution

Environment/lithology: shoreface; bioturbated siltstone and fine-grained sandstone

• The presence of relatively thick but fine-grained sandstone beds with HCS suggests that the succession most likely represents a shoreface environment.
• "The Weston Member at Priestweston Quarry consists of siltstones with occasional coarse sandstones [...]. The siltstones, which may be parted by thin developments of shales, are occasionally ripple laminated, and hummocky cross-stratification may also be developed in places. Bioturbation is common in some horizons. Fossils are not common and tend to occur in pockets." (Evans, 1992). The schematic log given in text-fig. 1 of Evans (1992) shows fine sandstone as most common secondary lithology and the cephalopod horizons whithin siltstone beds.

Size class: macrofossils

Preservation: cast, mold/impression, replaced with calcite

Collected by D. H. Evans

• NMW = National Museum of Wales

•"The sporadic occurence of fossils at Priestweston Quarry necessitated several visits to the site."

Primary reference: D. H. Evans. 2005. The Lower and Middle Ordovician cephalopod faunas of England and Wales. Monograph of the Palaeontographical Society 623:1-81 [B. Kröger/B. Kröger/B. Kröger]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89312: authorized by Björn Kröger, entered by Torsten Liebrecht on 15.05.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• The taxonomic list includes specimens referred to as "Dideroceras sp. nov." and/or "Cyclostomiceratidae gen. et sp. nov." in Evans (1992).
Cephalopoda
 Ellesmerocerida - Eothinoceratidae
Sacerdosoceras promus n. gen. n. sp.
Sacerdosoceras promus n. gen. n. sp. Evans 2005
NMW 88.30G.201a-e (holotype), 88.30G.202 to 88.30G.205 (paratypes)
 Endocerida -
? Endocerida indet. Hyatt in Zittel 1900
NMW 88.30G.67, referred to as "Endoceratid? family, genus and species indet A" in the reference
 Endocerida - Endoceratidae
Dideroceras festinans Blake 1882
NMW 88.30G.54 to 88.30G58