4: The Dalradian rocks of Jura

Abstract

Introduction General description of guide The Middle Dalradian rocks of Jura (Fig. 1) are of particular interest because, as a result of their mild deformation and metamorphism (lowest greenschist facies), a large proportion clearly exhibit original sedimentary structures. Although deformational structures and minor intrusions will be referred to, the main purpose of the excursions is to demonstrate the sedimentological features of a sequence of various marine facies. For the sake of simplicity the rocks will often be referred to as muds and sands although they are now mainly slates, phyllites and very hard quartzites. Exposure is good throughout the area, especially in the wave-cut benches of raised beaches from which many of the localities are described. Travel details Jura can only be reached by the car ferry from Port Askaig on Islay to Feolin Ferry. This connects with Western Ferries’ service which runs several times a day from Kennacraig (Fig. 1). . . .