- Author:
- Downie,C.
- Year:
- 1973
- Title:
- Observations on the nature of the acritarchs
- Reference:
- Downie,C. (1973) Observations on the nature of the acritarchs Palaeontology Vol. 16 # 2 P. 239- 259
- Google Academy:
- try to search by title in english
| Genus | Species | Country(Region) | From | To |
|---|---|---|---|---|
| Micrhystridium | Micrhystridium | Nd | Precambriam | Tertiary |
| Multiplicisphaeridium | Multiplicisphaeridium | Nd | Late Ordovician | Early Carboniferous |
| Multiplicisphaeridium | Multiplicisphaeridium sp | USA | Early Devonian | |
| Navifusa | Navifusa | Nd | Ordovician | Early Carboniferous |
| Neoveryhachium | Neoveryhachium | Nd | Middle Gothlandian | Early Devonian |
| Noremia | Noremia | Nd | Early Tertiary | |
| Onondagella | Onondagella | Nd | Late Gothlandian | Early Devonian |
| Ooidium | Ooidium | Nd | Cambrian | |
| Ooidium | Ooidium sp | USSR | Tremadocian | |
| Orthosphaeridium | Orthosphaeridium | Nd | Late Ordovician | |
| Orthosphaeridium | Orthosphaeridium sp. Down.,1973 sp. nov. | USA | Ashgillian | |
| Ozotobrachion | Ozotobrachion | Nd | Early Devonian | |
| Percultisphaera | Percultisphaera | Nd | Late Gothlandian | |
| Peteinosphaeridium | Peteinosphaeridium | Nd | Ordovician | |
| Piliferosphaera | Piliferosphaera | Nd | Middle Gothlandian | |
| Pleurozonaria | Pleurozonaria | Nd | Late Cretaceous | |
| Poikilofusa | Poikilofusa | Nd | Late Ordovician | Silurian |