Retusotriletes obscurus
- Citations total:
- 2
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| original | Middle Devonian | Illinois | Peppers,R.A. et al. Palynology and petrography of a Middle Devonian Coal in Illinois | 1969 | |
| details | Late Frasnian | Famennian | USSR(Siberia) | Menner,V.V. et al. Siberian Platform. (In: Devonian Systems. D.V.Nalivkin et al, editors) | 1973 |