| details |
Middle Ordovician |
Late Ordovician |
France |
Rauscher,R. Ordovician acritarchs from France. |
1974 |
| details |
Caradocian |
Ashgillian |
Algeria |
Jardin©,S. et al. Stratigraphic distribution of acritarchs in the Palaeozoic of the Algerian Sahara. |
1974 |
| details |
Llanvirnian |
|
Mediterranean Sea |
VavrdovЎ,M. Geographical differentiation of Ordovician acritarch assemblages in Europe. |
1974 |
| details |
Llanvirnian |
Llandeilian |
Libya |
Deunff,J. et al. Cambrian to Ordovician palynology and stratigraphy (Northwest Libya). |
1975 |
| details |
Wenlockian |
|
USSR(Tuvinskaya A.O.) |
Sheshegova,L.I. Phytoplankton of the Silurian from the Tuva, (the section of the "Elegest"). |
1975 |
| details |
Llanvirnian |
|
Morocco |
Deunff,J. Acritarch microplankton found in the Llanvirnian shales of the Anti-Atlas Mountains (Zagora-Morocco). |
1977 |
| details |
Middle Ordovician |
Late Ordovician |
Bulgaria |
Kalvacheva,R.K. Acritarch stratigraphy of Lower Paleozoic formations in the West Balkan Mountains, Bulgaria. |
1978 |
| details |
Llandeilian |
Caradocian |
Portugal |
Elaouad-Debbaj,Z. Late Ordovician acritarches of the Bucaco Syncline (Portugal); systematics-biostratigraphy-paleogeographic interests. |
1978 |
| details |
Late Arenigian |
Early Llanvirnian |
Bulgaria |
Kalvacheva,R.K. Palynological evidence (acritarcha) for the age of the Lower Paleozoic rocks in the Vakarel Hill, Bulgaria. |
1979 |
| details |
Middle Riphean |
Early Cambrian |
India(Karnataka) |
Viswanathiah,M.N. et al. Acritarchs and other associated microfossils of the Lodapur Formation, Kaladgi Group (Precambrian-Cambrian), South India. |
1979 |
| details |
Late Arenigian |
Early Llanvirnian |
Bulgaria |
Kalvacheva,R.K. Upper Arenigian to Lower Llanvirnian acritarchs from West Sredna Gora Mountain, Bulgaria. |
1980 |
| details |
Llandoverian |
|
Spain |
Hafenrichter,M. The lower and upper boundary of the Ordovician system of some selected regions, (Celtiberia, Eastern Sierramorena) in Spain. Part 2. The Ordovician/Silurian bounday in Spain. |
1980 |
| details |
Late Arenigian |
Early Llanvirnian |
England(Cumberland) |
Arthurton,R.S. et al. Ordovician and Silurian. (In: Geology of the Country around Penrith.) |
1981 |
| details |
Ordovician |
|
Finland |
Tynni,R. On Paleozoic microfossils in clastic dykes on the …land Islands and in the core samples of Lumparn. (In: Paleozoic sediments in the Rapakivi area of the …land Islands. L. Bergman, R. Tynni and B. Winterhalter, editors.) |
1982 |
| details |
Arenigian |
Ashgillian |
Saudi Arabia |
Fauconnier,D. Palynological study of Formations of Tertiary Upper Cretaceous, Devonian, Silurian, and Ordovician intersected in 11 boreholes in Northwestern of Royaume, Saudi Arabia (RS.1717) |
1984 |
| details |
Late Llanvirnian |
Llandeilian |
Bulgaria |
Kalvacheva,R.K. Acritarch evidence for Ordovician System in West Bulgaria |
1984 |
| details |
Early Ordovician |
|
E.Germany |
Colbath,G.K. The Lower Paleozoic organic-walled phytoplankton (Acritarch) genus Frankea Burmann,1970 |
1986 |