34<8 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Plate XVII. 



Sections in the Isle of Man, exhibiting the arrangement of the Southern Basin 

 and of the Tertiary Deposits in the neighbourhood of Ramsey. 



Section 1. From Balla Gawne, near Kirk Christ's Rushen, to Coshnahawin at 

 the mouth of Santon River, exhibiting the effects of denudation on the tertiary 

 beds, and illustrating the formation of alluvial basins. 



Section 2. From Scarlet Head to Umber Hill near Ballasalla. 



Section 3. From Penvick Bay near Port-le-Mun-ay through Poolvash and 

 Castletown Bays to the sea-coast at Langness Farm, illustrating the formation of 

 the stratified trap-tuff with the included Posidonia schist. 



N.B. These three sections are not seen continuously on the coast line, and are 

 in some parts theoretical as respects the palaeozoic formations. 



Section 4. Coast section exhibited south of Ramsey, showing the boulder clay 

 formation partly denuded and overspread by drift gravel, boulders and sand, the 

 latter much waved. 



Sections 5, 6. These sections are intended to illustrate the elevation of the 

 Brough at the mouth of the Santon River. The letters of reference, P, R S, re- 

 fer to the ground plan, Plate XVI., and the Sections are exhibited in the cliffs, the 

 observer being supposed to look towards the south-west in the diagram marked (5) 

 and north-east in that marked (6). 



