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Fossil specimen : BGS GSM19609 – Undifferentiated Type

Taxonomic Group

Kingdom Animalia

  Phylum Arthropoda

    Class Trilobita

      Order Phacopida

Fossil Name Calymene (Flexicalymene) brevicapitata (Portlock)
Type Status Undifferentiated Type
Name History

Calymene (Flexicalymene) brevicapitata  (Portlock)

Calymene brevicapitata (Portlock)

Calymene blumenbachii var brevicapitata (Portlock)

Calymene senaria Conrad

Calymene brevicapitata  (Portlock)

Calymene brevicapitatus (Portlock)

Registration No. GSM19609
Collector Portlock
Donor or Associated Person Name not available
Held By British Geological Survey Logo British Geological Survey
Country Northern Ireland
Locality Desertcreight, Tyrone
Grid Reference Not available
Rock Unit Ordovician Rocks (Undifferentiated)
Biozone Not available
Geological Age

Ordovician Period (Ordovician Period) (443.8 – 485.4 Ma B.P.)


Portlock, 1843, Geol. Rep. Londonderry, etc.,[left hand specimen on slab] ibid Page 286 pl 3 fig 3

Reed, 1952, Proc.Roy.Irish Acad.,55,B, No. 3, Page 119

Salter 1848 Appendix to Geol. Surv.Mem. II, Page 341

Salter 1865 Mon. Brit. Tril., ibid Page 97 pl.9 fig 7=right hand specimen

Salter, 1866, Appendix to Mem. Geol. Surv. III ibid Page 326 pl.17 fig10=left hand specimen

Shirley, 1931, ibid Page 28 pl.2figs9&10=lefthand specimen

Available Images

High resolution photographs


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Steroscopic photographs


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