Thrope Edge landslip scar (iv), Upper Nidderdale (Carboniferous of the United Kingdom)

Where: England, United Kingdom (54.2° N, 1.9° W: paleocoordinates 0.9° S, 6.2° E)

• small collection-level geographic resolution

When: E2 zone, upper (iv) division Member (Colsterdale Marine Beds Formation), Arnsbergian (327.0 - 323.7 Ma)

• Bisat (1914) referred to the marine strata as the Colsterdale Marine Beds, a term retained in this account.

• member-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, gray, carbonaceous shale

• Paleoenvironment could possibly be paralic or deltaic. There are a lot of preserved wood fragments and other plant remains. It was definitely near-shore, also definitely marine (according to the authors).
• predominantly gray and black shales intercalated with a thin limestone which locally degenerates into a band of calcareous nodules. (iv) dark grey sometimes highly fissile shale...soft and carbonaceous.

Preservation: replaced with pyrite

Primary reference: A. A. Wilson and A. T. Thompson. 1959. Marine bands of Arnsbergian age (Namurian) in the south-eastern portion of the Askrigg Block, Yorkshire. Proceedings of the Yorkshire Geological Society 32(3):45-68 [J. Alroy/M. Sommers/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 8461: authorized by John Alroy, entered by Mike Sommers on 12.07.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Goniatitida - Girtyoceratidae
Eumorphoceras bisulcatum
Eumorphoceras bisulcatum Girty 1909 ammonite
geronitic form
 Goniatitida - Dimorphoceratidae
? Dimorphoceras sp.
? Dimorphoceras sp. Hyatt 1883 ammonite
 Goniatitida - Anthracoceratidae
Anthracoceras paucilobum
Anthracoceras paucilobum Phillips 1836 ammonite
Bivalvia
 Ostreida - Posidoniidae
Posidonia trapezoedra, Posidonia wapanuckensis, Posidonia cf. corrugata
 Pectinida - Limatulinidae
Limatulina sp.
Limatulina sp. Koninck 1885 scallop
 Myalinida - Myalinidae
Posidoniella variablis, Posidoniella sulcata, Posidoniella minor, Posidoniella laevis