| 
Country:
 | 
Germany 
 | 
| 
Province:
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Rhenish Mountains 
 | 
| 
Locality:
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Essen-Borbeck, Wolfsbank mine 
 | 
| 
Layer:
 | 
Westfal A1 | 
| 
Lower Boundary:
 | 
Yeadonian--Langsettian, Westph.A [YEA--, 313 million years
 
 | 
| 
Upper Boundary:
 | 
DER Westphal.A1--Westphal.A2 [MEL--VRK], 311.5 million years
 
 | 
| 
Georeference:
 | 
 |