| original |
Middle Cambrian |
Tremadocian |
Spain |
Fombella,M.A. Acritarchs of the Oville Formation, Middle Cambrian-Tremadocian age, Province of Leon, Spain. |
1978 |
| details |
Early Tremadocian |
|
Spain |
Fombella,M.A. Palynology of the Oville Formation, north and south Cantabrian Mountains. |
1978 |
| details |
Late Cambrian |
Tremadocian |
Spain |
Fombella Blanco,M.A. Palynological determination of the Tremadocian in locality of Verdiago, Leon Province, the North of Spain |
1982 |
| details |
Middle Cambrian |
|
Morocco |
Vanguestaine,M. et al. Middle Cambrian acritarchs of Tacheddirt Valley (High Atlas, Morocco) in the context of an new zoning of the Cambrian. |
1983 |
| details |
Late Cambrian |
|
Spain |
Fombella Blanco,M.A. Resemblances and differences between the palynological associations of Upper Cambrian age in the northwest of Spain, (Vozmediano), and North of Africa. |
1987 |
| details |
Early Cambrian |
Ordovician |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Cambrian |
Ordovician |
Spain |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |