Late Albian (Upper Gault)

Zonal and Sub-Zonal Ammonites

Mortoniceras inflatum Zone

Zonal Ammonite Mortoniceras inflatum
Sub-Zonal Ammonite Callihoplites auritus
Sub-Zonal Ammonite Hysteroceras varicosum
Sub-Zonal Ammonite Hysteroceras orbignyi
Sub-Zonal Ammonite Dipoloceras cristatum

References:

a. Wright C. W. 1996. Treatise on Invertebrate Paleontology (Part L Mollusca 4 Revised) Volume 4: Cretaceous Ammonoidea b. Spath L. F. 1929. A Monograph of the Ammonoidea of the Gault; Part VIII. Palaeontographical Society London

Jim Craig - 2000