Protosphaeridium spinosum
- Citations total:
- 2
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| details | Early Gedinnian | USSR(Estonian SSR) | Spasskiy,N.Y. Spores: Gedinian to Early Eifelian, Late Middle Devonian boundary at the Base of Takada, Salairka and Pyarnees species list. (In: A Colloquia on the fauna and flora of Lower to Middle Devonian horizons of USSR) | 1978 | |
| details | Early Gedinnian | USSR(Tyumenskaya Oblast) | Spasskiy,N.Y. Spores: Gedinian to Early Eifelian, Late Middle Devonian boundary at the Base of Takada, Salairka and Pyarnees species list. (In: A Colloquia on the fauna and flora of Lower to Middle Devonian horizons of USSR) | 1978 |