GB3D Type Fossils

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Fossil specimen : BGS GM103612 – Paratype

Taxonomic Group

Kingdom Animalia

  Phylum Brachiopoda

    Class -

      Order -

Fossil Name Rhactorthis crassa Williams
Type Status Paratype
Name History

Rhactorthis crassa Williams

Registration No. GM103612
Collector Name not available
Donor or Associated Person BM(NH)
Held By British Geological Survey Logo British Geological Survey
Country Wales
Locality Craigian Bychain
Grid Reference Not available
Rock Unit Gelli-Grin Calcareous Ash Formation
Biozone Not available
Geological Age

Woolstonian Substage (Ordovician Period) – Longvillian Substage (Ordovician Period) (452.1 – 454 Ma B.P.)

[Closest ICS interval: Katian Age – Sandbian Age ]


Williams 1963, Bull BM(NH) vol.8 no.7 pl.4, fig.3

Available Images

High resolution photographs


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Steroscopic photographs


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