Country:
|
France
|
Province:
|
Nord-Pas-de-Calais
|
Locality:
|
Valenciennes,Houillères
|
Layer:
|
Retic.nodosum horizon,pl.G,H,I,J |
Lower Boundary:
|
GBY R1a--R1b (R.dubium--R.eoreticulatum), 316 million years
|
Upper Boundary:
|
GBY R1b--R1c (Ph.nodosum--R.reticulatum), 315.4 million years
|
Georeference:
|
|