GB3D Type Fossils

 Home   The project   Search  About fossils Contributors Downloads Links Contact us

Fossil specimen : BGS GSM18150 – Holotype

Taxonomic Group

Kingdom Animalia

  Phylum Mollusca

    Class Cephalopoda

      Order Ammonitida

Fossil Name Aulacostephanus (Aulacostephanus) fallax Ziegler
Type Status Holotype
Name History

Aulacostephanus (Aulacostephanus) fallax Ziegler – See Ziegler (1962): Holotype

Aulacostephanus sp nov aff anglicus evallidus Lamplugh, pars – See Arkell, WJ (1906)

Registration No. GSM18150
Collector Danford Collection. 1906
Donor or Associated Person Danford, CG. 1906
Held By British Geological Survey Logo British Geological Survey
Comments Kimmeridge Clay - pseudomutabilis Zone.
Country England
Locality Speeton - North Yorkshire.
Grid Reference Not available
Rock Unit Kimmeridge Clay Formation
Biozone Not available
Geological Age

Kimmeridgian Age (Jurassic Period) (152.1 – 157.3 Ma B.P.)


Arkell, WJ. 1906-1908. Proc Yorks Geol Soc plXIV.,fig1

Arkell, WJ. 1933. Jurassic System plXXXIX.,fig3

Ziegler. 1962. Palaeontographica pl16.,fig4

Available Images

High resolution photographs


5846 KB

Steroscopic photographs


6648 KB

View these images in your web browser using our JPEG2000 viewer. Zoom in and out and pan around in high resolution. Requires JavaScript to be enabled.

Download these images as high resolution JPEG2000 files. You may need to use image-editing software to view these files.

click image or here to close