East bank of Calder River, 6 km east of Egremont (Ordovician of the United Kingdom)

Also known as Skiddaw Group fauna, Lake District, UK

Where: England, United Kingdom (54.5° N, 3.4° W: paleocoordinates 71.9° S, 15.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: "basal" Member (Buttermere Formation), Migneintian (485.4 - 478.6 Ma)

• Cooper et al. (1995): This might be pre-Buttermere; if not, then it is basal Buttermere. Given that no formation has been recognized, I am putting it in an informal "basal" member of the Buttermere (PJW).

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray shale and siltstone

• Grey mudstone and siltstone with some thin sandstone beds

Size classes: macrofossils, mesofossils

Primary reference: A. W. A. Rushton. 1988. Tremadoc trilobites from the Skiddow Group in the English Lake District. Palaeontology 31:677-698 [A. Miller/P. Novack-Gottshall/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 3709: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 07.08.1999, edited by John Alroy

Creative Commons license: CC BY (attribution)

Taxonomic list

• Trilobite systematics
Artiopoda
 Agnostida - Metagnostidae
Geragnostus callavei
river Calder, Loc. 1
Trilobita
 Ptychopariida - Shumardiidae
Shumardia sp. Billings 1862 trilobite
subgenus Conophrys: river Calder, Loc. 1
 Asaphida - Asaphidae
Niobina davidis trilobite
river Calder, Loc. 1
 Asaphida - Nileidae
Nileidae "indet. sp. 1" Angelin 1854 trilobite
river Calder, Loc. 1
Nileidae "indet. sp. 2" Angelin 1854 trilobite
river Calder, Loc. 1
 Asaphida - Cyclopygidae
Prospectatrix brevior n. sp. trilobite
type and two others from river Calder, Loc. 1, fourth specimen from Loc. 2
Bohemilla sp. Barrande 1872 trilobite
subgenus Bohemilla: river Calder, Loc. 1
 Olenida - Olenidae
Parabolinella triarthroides Harrington 1938 trilobite
river Calder, Loc. 1
Peltocare olenoides Salter 1866 trilobite
"Most are from Loc. 1; one or two specimens from each of Loc. 2 and 3"
 Olenida - Eulomidae
Pareuloma expansum n. sp. trilobite
river Calder, Loc. 1