| details |
Middle Ordovician |
Late Ordovician |
Kentucky |
Schopf,J.M. et al. Acid-resistant microfossils from the Cynthiana Formation and Eden Group. |
1961 |
| details |
Ordovician |
Devonian |
North Dakota |
Jodry,R.L. et al. Small Pseudochitinous and Resinous microfossils |
1961 |
| details |
Ordovician |
Devonian |
Canada(Manitoba) |
Jodry,R.L. et al. Small Pseudochitinous and Resinous microfossils |
1961 |
| details |
Early Devonian |
|
Brazil(Amazonas) |
Sommer,F.W. Preliminary note on Lower Devonian microfossils of the Amazon Basin. |
1960 |
| details |
Silurian |
|
Africa(Sahara) |
de Jekhowsky,B. et al. On the presence of numerous chitinozoans in the Silurian-Devonian of the Sahara. |
1959 |
| details |
Cambrian |
Mississippian |
USA(Midwest) |
Wilson,L.R. Composite micropaleontology and its application to Tertiary and near-recent stratigraphy. |
1956 |
| details |
Cambrian |
Mississippian |
Canada |
Wilson,L.R. Composite micropaleontology and its application to Tertiary and near-recent stratigraphy. |
1956 |