William Joscelyn Arkell; Note on the alleged Purbeckian at Murzuch, Fezzan, Libya. Geological Magazine ; 88 (5): 315. doi:
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On the basis of re-examination of a gastropod formerly misidentified as Valvata helicoides, the Murzuch limestone is considered to be much younger than the upper Jurassic age (Purbeckian) which was originally assigned to it.
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