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



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