Age of the Girvan-Ballantrae Serpentine

Between Kennedy's Pass, 4 miles south of Girvan, and Currarie Port, 3½ miles south of Ballantrae, the coast is occupied by a varied assemblage of igneous rocks that have a north-easterly strike and extend inland for several miles (Text-fig. 1). The most important members of this assemblage are a series of spilite lavas and two large outcrops of serpentine. In the present paper it is not intended to give a general description of these rocks, but to concentrate upon the age-relationship of the serpentine to the lavas and associated sediments, in which Lapworth and later workers discovered Arenig fossils.