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Fossil specimen : BGS GSM14020 – Lectotype

Taxonomic Group

Kingdom Animalia

  Phylum Arthropoda

    Class Trilobita

      Order Asaphida

Fossil Name Cryptolithus latus Portlock
Type Status Lectotype
Name History

Cryptolithus latus Portlock

Trinucleus concentricus var E Portlock

Trinucleus caractaci Murchison

Trinucleus portlockii Salter

Trinucleus concentricus Eaton

Trinucleus (Cryptolithus) portlockii Salter

Registration No. GSM14020
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 Caradoc Rocks (Undifferentiated)
Biozone Not available
Geological Age

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

[Closest ICS interval: Late Ordovician Epoch ]


Portlock, 1843,Geol. Rep.Londonderry,etc pl. 1B,fig. 3a,3b

Reed,1952,Proc. Roy.Irish Acad. ,55,B, no. 3 pg.99-100as lectotype of T. portlockii Salter

Salter, 1853,Dec. VII Mem. Geol. Surv. pg. 6 pl. VII

Available Images

High resolution photographs


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Steroscopic photographs


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3D Scans

1: bracket /BGS/GSM_14020

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