338 THE CAUSES OF THE XI 
referred. The finer or coarser sediments that 
are carried down by the current of the river, 
will only be carried out a certain distance, and 
eventually, as we have already seen, on reaching 
the stiller part of the ocean, will be deposited . 
the bottom. 
Let C y (Fig. 4) be the sea-bottom, y D the 
shore, z y the sea-level, then the coarser deposit 
will subside over the region B, the finer over A, 
while beyond A there will be no deposit at all; 
Ons Fig.4. 4 
and, consequently, no record will be kept, simply 
because no deposit is going on. Now, suppose 
that the whole land, C, D, wists we have regarded 
as stationary, goes down, as it does so, both A and 
B oe ashe out from the shore, which will be at 
y; x, y, being the new sea-level. The con 
sabbastate will be that the layer of mud (A), being 
now, for the most part, further than the force of 
the current is strong enough to convey even th 
finest débris, will, of course, receive no mol 
