Abstract
Abstract The discovery of a mid-late Wenlock (Silurian) graptolite and orthoconic nautiloid fauna at Traie Dullish Quarry, Peel Hill, in the Niarbyl Formation (Dalby Group) of the Isle of Man, disproves all earlier correlations between the Niarbyl and Lonan Flags on the west and east coasts of the island, respectively. All previous structural hypotheses require re-examination. The graptolites comprise Cyrtograptus cf. lundgreni, Monograptus flemingii cf. warreni and Monograptus ex gr. flemingii . They suggest, but do not prove, a lundgreni Biozone age, thus indicating a possible correlation between the Niarbyl Formation and the Birk Riggs Formation of the English Lake District, and the Denhamstown Formation of the Balbriggan Inlier, Southern Ireland.
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