| original |
Tremadocian |
|
England(Shropshire) |
Rasul,S.M. The Lower Palaeozoic acritarchs Priscogalea and Cymatiogalea |
1974 |
| details |
Tremadocian |
|
England(Shropshire) |
Rasul,S.M. et al. The stratigraphic distribution of Tremadoc acritarchs in the Shineton Shales succession, Shropshire, England. |
1974 |
| details |
Late Tremadocian |
|
England(Cumberland) |
Molyneux,S.G. et al. Discovery of Tremadoc rocks in the Lake District. |
1984 |
| details |
Late Tremadocian |
Early Arenigian |
Wales(Carmarthenshire) |
Molyneux,S.G. et al. Acritarchs dating of Latest Tremadoc - Earliest Arenig (Early Ordovician) sediments in the Carmarthen District, South Wales. |
1989 |
| details |
Tremadocian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Late Cambrian |
Early Ordovician |
Algeria |
Stricanne,L. et al. A statistical approach to classification of the Cambro-Ordovician galeate acritarch plexus |
2002 |