Inchfield Moor, Gastrioceras cumbriense Marine Band, shale Unit 3 (Carboniferous of the United Kingdom)

Also known as Inchfield Moor, Gastrioceras cumbriense Marine Band, shale Unit 3, the acme shale

Where: England, United Kingdom (53.7° N, 2.1° W)

• Paleocoordinates: 10.5° S, 1.8° E (Wright 2013)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Gastrioceras cumbriense ammonoid zone, shale Unit 3 Member (Gastrioceras cumbriense Marine Band Formation), Yeadonian (320.0 - 318.7 Ma)

• The Gastrioceras cumbriense Marine Band generally does not exceed 60cm in thickness. The band is split into five units, the lower barren shales (Unit 1), the advance shales (Unit 2), the acme shales (Unit 3), the retreat shales (Unit 4), and the upper barren shales (Unit 5).

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, pyritic, black shale and lithified ironstone

• The continuing transition and deepening of the sea caused a rapid transition to conditions of black paper shale deposition. The development of the shale appears to be synchronous as it contains a consistant pelagic fauna and has a widespread spatial distripbution throughout the north of England. The shales display planar stratified bedding planes with a spacing of 0.5 to 0.75 mm. There is little evidence for wave or current activity or bioturbation. At all localities the presence of pyrite blebs around which stratification is deflected is believed to indicate primary pore filling as a shallow depth of burial in tyhe sulphate reduction zone. ... The fauna of the balck shale is dominated by the thickshelled goniatite phase at the four easterly localities...At Inchfield Moor the black shale is overlain by 0.12m of highly rotted ironstone in which the fauna occurs uncompacted

Size class: macrofossils

Primary reference: P. B. Wignall. 1987. A biofacies analysis of the Gastrioceras cumbriense marine band (Namurian) of the central Pennines. Proceedings of the Yorkshire Geological Society 46(2):111-121 [J. Alroy/C. Simpson/M. Uhen]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 41239: authorized by John Alroy, entered by Carl Simpson on 09.07.2004

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonoida - Gastrioceratidae
Gastrioceras cumbriense, Gastrioceras crenulatum, Gastrioceras aff. coronatum, Gastrioceras spp.
Gastrioceras spp. Hyatt 1884 ammonite
Junevile
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
coiled
Gastropoda
 Ptychomphaloidea - Ptychomphalidae
Ptychomphalus sp.
Ptychomphalus sp. Agassiz 1839 snail
Bivalvia
 Pectinida - Pterinopectinidae
Dunbarella elegans
 Cardiidia - Sanguinolitidae
Sanguinolites sp.
Sanguinolites sp. M'Coy 1844 clam