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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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Gressingham Beck 
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| 
Layer:
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nodular limestone in the Cravenoceras gr | 
| 
Lower Boundary:
 | 
Pendleian--Arnsbergian        [PND--ARN], 324 million years
 
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| 
Upper Boundary:
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GBY E2a1--E2a2 (cowlingense--bisulcatum), 323.5 million years
 
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| 
Georeference:
 | 
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