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Fossil specimen : SM A 29185 - A 29188 – Paratype

Taxonomic Group

Kingdom Animalia

  Phylum Brachiopoda

    Class Strophomenata

      Order Strophomenida

Fossil Name Leptestiina derfelensis (Jones O.T.), 1928
Type Status Paratype
Name History

Leptestiina derfelensis (Jones O.T.), 1928

Leptellina derfelensis (Jones O.T.)

Leptelloidea derfelensis Jones: Paratype

Plectambonites llandeiloensis (Davidson)

Registration No. A 29185 - A 29188
Collector Name not available
Donor or Associated Person Elles, Gertrude Lilian (1872-1960)
Held By Sedgwick Museum of Earth Sciences Logo Sedgwick Museum of Earth Sciences
Country Wales
Locality Derfel gorge, Arenig Station, Wales
Grid Reference Not available
Rock Unit Derfel Limestone (base)
Biozone Not available
Geological Age

Caradoc Series (Ordovician Period) (451 – 460.9 Ma B.P.)

[Closest ICS interval: Late Ordovician Epoch ]


Elles, G.L. 1922. The Bala Country: its Structure and Rock Succession Quarterly Journal of the Geological Society of London volume lxxviii pages 132 - ? (1): p.169

Jones, O.T. 1928. Memoirs of the Geological Survey of England and Wales (Palaeontology) vol. i part 5 (2): i part 5, p.479

Available Images

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