83 



which have been conveyed direct from land soon become 

 sorted by falHng through the water. Even if only a sHght 

 current is present, the finest particles will be conveyed several 

 miles from the place where they were washed into the sea, 

 the rock-fragments will sink to the bottom almost immediately, 

 while the medium sized grains will be deposited in the space 

 between. If the current runs parallel with the shore, the in- 

 gredients from the different places will be mixed up with one 

 another, so that nearest land will be formed a very mixed 

 deposit, whereas some of the finest material will be conveyed 

 some distance away from the shore. If, on the contrary, 

 the current flows at some distance from the shore, as is espe- 

 cially the case near projecting points, the ingredients will be 

 far more completely sorted, so that almost exclusively coarse 

 material will be deposited near land while all the finer material 

 will be conveyed far out sea. 



Various circumstances may however influence deposition 

 which is thereby rendered very complicated. Thus, instances 

 have been given above of the influence on the fineness of the 

 deposits exercised by differences in depth, which may some- 

 times be very great. If there is a somewhat straight coast-line 

 along which runs a fairly constant current as is the case with 

 the Liverpool Kyst, the difference between adjacent depo- 

 sits at the same distance from land will be very great, provided 

 there is a great difference in the depth. When the current 

 runs over a comparatively deep place, the speed will be slight 

 and the finest particles will have time to get deposited in 

 such great quantities that the sample will be almost pure 

 clay, whereas in the less deep parts, the current will be so 

 rapid that sand and stones will be almost exclusively depo- 

 sited. 



In llie bays it is rather different, especially in the smaller 

 ones, where the area is not large enough for the lide to pro- 

 duce currents. There almost all the ingredients will be able 



