Abstract
Abstract The Eglinton Volcanics are mapped as two lithologically distinct terranes separated by the Mistake Diorite of the Mackay Intrusives. The eastern (Plato) terrane which is divided into four formations consists largely of marine deposits, including an Atomodesma limestone member. It is a steeply dipping east-younging sequence of basic to intermediate volcanogenic sediments intruded by abundant basaltic dikes. Turbidites of volcaniclastic detritus are common but pillow lavas and flow rocks are not recognised. Fossils from two new localities include brachiopods and bivalves which confirm the Early to Middle Permian age of these rocks established by Landis & Waterhouse. Rocks of the western (Largs) terrane are mainly of andesitic to dacitic composition and predominantly volcaniclastic, although massive andesite bodies are mapped at either end of the terrane. Fossils, limestones, and turbidites are unknown whereas strongly hematitic rocks, restricted to minor occurrences in only the lowermost strata of ...
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