The environmental significance of some faunal changes in the Upper Ardmillan succession (upper Ordovician), Girvan, Scotland

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Abstract
A series of discrete, distinctive faunules has been established for the Upper Ardmillan succession in the Girvan district. The faunules, collected from a diverse suite of clastic sedimentary rocks in a well defined stratigraphical framework, belong to the Whitehouse Group, the Shalloch Formation, the Drummuck Group, and the High Mains Formation; these rock units range in age from late Caradoc (Onnian) to late Ashgill (Hirnantian). The brachiopod associations identified within each faunule are outlined; few are considered indigenous. The series of faunal changes is fundamental to the assessment of the depositional environment of the sequence.