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Country:
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Great Britain 
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| 
Province:
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England,Lancashire 
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Locality:
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Blackburn, Samlesbury Bottom, R.Darwen 
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| 
Layer:
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E2c3 | 
| 
Lower Boundary:
 | 
DER E2b--E2c(Cravenocerat.--Nuculoceras), 321 million years
 
 | 
| 
Upper Boundary:
 | 
Arnsbergian--Chokierian [ARN--CHO], 319 million years
 
 | 
| 
Georeference:
 | 
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