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, University of Cambridge
|
| Comments |
| 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 ] |
| References | 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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