Where: Northamptonshire, United Kingdom (52.2° N, 1.0° W: paleocoordinates 39.6° N, 7.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Marlstone Rock Formation, Spinatum (189.6 - 183.0 Ma)

• Only known from the top three or four feet of the spinatum Zone. It occurs commonly in a shell band near the top of the Marlstone Rock-bed, associated with the earliest dactylioceratid ammonites.

Environment/lithology: lithified limestone

Size class: macrofossils

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 138200: authorized by Matthew Clapham, entered by Matthew Clapham on 06.01.2013

Creative Commons license: CC BY (attribution)