The Coast-line 



tributaries of Clifftown Burn were visited to seek for 

 evidence of the inland prolongation of the fault seen in 

 the cliffs. It was readily found in the lower stream, the 

 chalk and greensand being seen separated by a narrow 

 band of crushed and polished rock, such as was seen to 

 accompany the fracture in the cliffs below. In the upper 

 tributary the fault, though still observable, was evidently 

 dying out, as the displacement of the rocks was only a 

 few inches. 



On the homeward journey the line of the great basalt 

 dyke of Black Point was easily traced, as it formed a 

 prominent ridge on the surface of the land, and had 

 been excavated in several places for road metal. 



The line of junction between the chalk and the 

 Pliocene was observed in a chalk-pit near the point 

 where the road to Seaview branched off from the main 

 road to Port Hutton. 



We were now in a position to draw a section 

 illustrating the structure of the cliffs from Seaview to 

 Clifftown, and an examination of this served to remind 

 us of the main features of the region (Fig. 10). 



Our next expedition was along the beach from 

 Seaview towards the mouth of the estuary of the Hutton 

 River. Here there were no cliffs, but there was a great 

 bank of shingle backed by rows of sand-dunes, some of 

 which reached a height of 60 to 70 feet. These dunes 

 were accumulating under the influence of the wind, which 

 was constantly carrying up sand from the beach and 

 depositing it here. 



Some years ago the sand-dunes commenced to travel 

 inland towards Port Hutton, destroying several farms 

 and even threatening the town itself, but the movement 



87 



