North Allington, Stone bed under Junction bed (Jurassic of the United Kingdom)

Where: England, United Kingdom (50.7° N, 2.8° W: paleocoordinates 37.9° N, 6.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Margaritatus (189.6 - 183.0 Ma)

• Not spinatum zone (as in Ager 1954), based on revision of ammonite stratigraphy by Howarth 1957 (Ager 1962).

Environment/lithology: marine; lithified lithology not reported

Size class: macrofossils

Collected by J.F. Walker; reposited in the BMNH

Primary reference: D. V. Ager. 1954. The genus Gibbirhynchia in the British Domerian. Proceedings of the Geologists' Association 65:25-51 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 138203: authorized by Matthew Clapham, entered by Matthew Clapham on 06.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Rhynchonellida - Tetrarhynchiidae
Gibbirhynchia thorncombiensis Buckman 1922
Rhynchonella tetrahedra var. northamptonensis in Walker, 1892
Quadratirhynchia crassimedia Buckman 1917
ssp. depressa (not necessarily from Stone Bed)