GB3D Type Fossils

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Fossil specimen : SM A 99006 – Holotype

Taxonomic Group

Kingdom Animalia

  Phylum Arthropoda

    Class Trilobita

      Order Ptychopariida

Fossil Name Tretaspis convergens var. oneratus McNamara ms., 1975
Type Status Holotype
Name History

Tretaspis convergens var. oneratus McNamara ms., 1975: Holotype

Tretaspis convergens var. oneratus McNamara ms., 1975

Registration No. A 99006
Collector Name not available
Donor or Associated Person Nicholas, Tressilian Charles (1888-1989)
Held By Sedgwick Museum of Earth Sciences Logo Sedgwick Museum of Earth Sciences, University of Cambridge
Country England
Locality Lake District (S.), Cumbria, England
Grid Reference Not available
Rock Unit Torver Formation
Biozone Not available
Geological Age

Cautleyan Stage (Ordovician Period) (447 – 448 Ma B.P.)

[Closest ICS interval: Katian Age ]


McNamara, K.J. 1975. Kenneth J. McNamara. Upper Ordovician stratigraphy and trilobites of the southern Lake District Published: Cambridge, 1975. Ph D dissertation: University of Cambridge (1):

McNamara, K.J. 1979. Palaeontology vol. 22 (3): p.60 pl.8 figs.1-4 (latex cast)

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