original |
Late Llandoverian |
Early Wenlockian |
Belgium |
Verniers,J. et al. Silurian graptolites and chitinozoans from the Burdinale Valley, Brabant Massif, Belgium. |
1979 |
original |
Late Llandoverian |
Early Wenlockian |
Belgium |
Verniers,J. The Silurian chitinozoa of the Mehaigne area (Brabant Massif, Belgium). |
1982 |
original |
Early Wenlockian |
|
Belgium |
Verniers,J. Calibration of Chitinozoa versus graptolite biozonation in the Wenlock of Builth Wells district (Wales, U.K), compared with other areas in Avalonia and Baltica. |
1999 |