240 



C. CALLAWAY ON THE LIMESTONE 



Fig. 1. — SJcetcJi Map of the Durness Area. 

 (Scale, about | inch to 1 mile.) 



The fault f l runs from sea to sea, east and west, exactly at the 

 base of Far-out Head, which is entirely composed of thin-bedded 

 gneiss and quartz-schist, dipping steadily to the north-east, except 

 at some points a mile north of the fault, where the dip is conse- 

 quently unimportant. 



West of the ruined church, where the limestone contains numerous 

 fossils, the dip is north-east, so that it might seem as if it passed 

 beneath the schist. But here the nearest exposure of the latter is 

 over half a mile to the north-east, the intervening area being occu- 

 pied by blown sand, so that no junction can be seen. Further ex- 

 amination proves that this dip of the limestone is exceptional. 



Following the strike of the schist to the south-east, we trace it 

 right up to the fault. Both rocks are here clearly exposed, the flags 

 on the shore and in the adjoining field, and the limestone in a low 

 cliff, which is an inland extension to the west of the precipice of 

 Creag Chearbach. The fault runs along the base of the cliff. The 

 flags dip uniformly to the north-east, the nearest section being only 

 twenty yards from the limestone, which, at this point, dips east- 



