GB3D Type Fossils

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Fossil specimen : BGS GSM12447 – Holotype

Taxonomic Group

Kingdom Animalia

  Phylum Mollusca

    Class Bivalvia

      Order -

Fossil Name Cyrtodonta? securiformis (Portlock)
Type Status Holotype
Name History

Cyrtodonta? securiformis (Portlock)

Orthodesma tyronense Reed

Cyrtodonta? semiformis (Portlock)

Registration No. GSM12447
Collector Portlock
Donor or Associated Person Name not available
Held By British Geological Survey Logo British Geological Survey
Comments Original museum label with 12445 and Counterpart is Ulster Museum K4201
Country Northern Ireland
Locality Desertcreat, Caradoc
Grid Reference Not available
Rock Unit Caradoc Rocks (Undifferentiated)
Biozone Not available
Geological Age

Caradoc Series (Ordovician Period) (449 – 458.4 Ma B.P.)

[Closest ICS interval: Late Ordovician Epoch ]


Reed 1952 Proc Roy Irish Acad 55 B No 3 p.70 pl. 3 fig 17

Tunnicliff 1982 Pal Vol 25 Part 1 p.69 pl. 11 fig.5

Available Images

High resolution photographs


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Steroscopic photographs


4125 KB

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