| original |
Harnagian |
Onnian |
England(Shropshire) |
Turner,R.E. Acritarchs from the type area of the Ordovician Caradoc Series, Shropshire, England. |
1984 |
| details |
Harnagian |
Onnian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Late Ordovician |
|
England(Shropshire) |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |
| details |
Nd |
|
Nd |
Sarjeant,W.A.S. et al. The acritarch genus Polygonium, Vavrdova emend. Sarjeant and Stancliffe 1994: a reassessment of its constituent species. (In: Stratigraphie du Mesozoique et du Cenozoique. M.Streel, editor) |
1996 |