Pterospermopsimorpha annulata
- Citations total:
- 1
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| details | Cambrian | Ordovician | USSR(Taymyr Nat.Okrug) | Sobolevskaya,R.F. et al. Transitional Cambrian-Ordovician Beds in Taimyr (Grustninsk Beds). (In: The Precambrian and Cambrian of the Taimyr Peninsula. A Collection of Six Scientific Papers. V.Y.Kabankov, editor) | 1981 |