Tasgar Quarry (Ordovician of the United Kingdom)

Also known as Shelve inlier

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 artus graptolite zone, Stapeley Volcanic Member (Hope Shale Formation), Abereiddian (468.0 - 461.1 Ma)

• " [...] Stapeley Volcanic Member, Shelve Formation [according to the stratigraphic chart in text-fig. 2 of the reference this should read: Hope Shale Formation], artus Biozone, Abereiddian Stage, Llanvirn Series" (Evans & Cope, 2003).

• group of beds-level stratigraphic resolution

Environment/lithology: deep-water; siltstone and tuff

• "The presence of debris-flow deposits, some with well-rounded boulders up to 0.8 m across, have been interpreted as evidence of an emergent volcanic island as a source area, although generally the mudstones and the accumulations of volcanic detritus in the Hope Shale Formation were deposited in a relatively deep-water environment." (Brenchley et al., 2006 p. 51, in Brenchley & Rawson (eds.), The Geology of England and Wales).
• " [...] very fine tuffs and siltstones [...]"

Size class: macrofossils

Preservation: cast

Reposited in the SM

Primary reference: D. E. Evans and J.C.W. Cope. 2003. Systematic position of Pollicina corniculum (Eichwald, 1860) (Mollusca, Tergomya) from the Middle Ordovician of the United Kingdom. Palaeontology 46(1):139-149 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89464: authorized by Björn Kröger, entered by Torsten Liebrecht on 22.05.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Tergomya
 Cyrtonellida - Pollicinidae
Pollicina corniculum
Pollicina corniculum d'Eichwald 1860
SM A43988, A43990 + 43991 (part and counterpart)