William Joscelyn Arkell; A revision of the upper Oxfordian ammonites of Trept (Isere), figured by de Riaz. Geological Magazine ; 83 (3): 129–136. doi:
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An annotated list of revised determinations of the upper Oxfordian (Jurassic) ammonites figured in the plates accompanying A. de Riaz's monograph on ammonites from the Peltoceras transversarium zone of Trept, Isere, France, published in 1898.
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