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Wealden : Weald-formation. Portland : Upper oolithic. Oxford : Middle oolithic. Bath : Lower oolithic. Lias : Liassic. Keuper : Upper triassic. Muschelkalk : Middle triassic. Bunter : Lower triassic. Permian : 14. Zechstein : Upper permian. Permian : 13. Neurot sand : Lower permian. Carboniferous sandstone : Upper carboniferous. Carboniferous limestone : Lower carboniferous.
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