■Vol. 54.] 



IN SOUTH WALES, DEVON, AND CORNWALL. 



263 



timber viaduct were driven down to the rock, and the cross-section 

 of the creek so obtained is given in fig. 9. The greatest depth 

 to the rock reached was 65 feet below the level of low-water 

 spring-tides, the silt being 75 feet deep over it. The rock-sides 

 slope 1 in 1 j and 1 in 3. 



I^oss Creek is crossed by a viaduct close by. 



Just above Kiugswear, opposite Dartmouth, is Waterhead Creek, 

 ■crossed by a timber viaduct, during the construction of which borings 



were made, and piles were driven 

 down to the rock at frequent inter- 

 vals. The greatest depth reached was 

 91 feet below the level of low-water 

 spring-tides, the mud and silt at that 

 point being 95 feet deep. The sides 

 of the rock- valley were found to slope 





in 2^ and 1 in 



2^ 



^2- 



At Kings wear Jetty several lines of 

 borings were made, and many piles 

 were driven, extending into the river 

 for 120 feet from low-water mark, 

 nearly at right angles with the Water- 

 head Creek section. The rock was 

 proved to a depth of 71 and 73 feet 

 below the level of low-water spring- 

 tides. The silt was 52 feet deep, and 

 over the rock was found about 4 feet 

 of stiff red clay and stones. A little 

 seaward of the jetty the entrance to 

 the harbour has since been widened 

 by dredging, and beneath the silt 

 there a deposit was found too stiff 

 to dredge. On examination in a 

 diving-dress it was found to contain 

 boulders of Dartmoor granite and 

 white quartz. 



The continuation of the slopes of 

 the rock-sides at the Kingswear Jetty 

 section down to the Maypool depth, 

 and completing a section across the 

 river from the rock exjDOsed in the 

 channel on the south side, gives a 

 cross-section very similar to that of 

 the rock-valley at Maypool (fig. 8). 

 Between Kingswear and Maypool 

 now there is nowhere a greater depth of water than 54 feet, and the 

 bottom is everywhere mud, sand, or gravel. Lower down in the 

 narrow entrance is a depth of 78 feet, but seaward of that, and 

 within a line drawn across from Coombe Point to inside the Mew- 

 stone, there is no depth greater than 40 feet, the bottom being 

 nearly flat, of mud, sand, gravel, and shells, with rocks appearing here 



