THE WORK OF THE OCEAN 



321 



mentary formations made in shallow water from those made in 

 deep water, even after they have been converted into solid rock, 

 and after the rock has emerged from the sea. Many of these char- 



265. Cross-bedding. (Gilbert). 



acteristics are, however, shared by deposits made by streams on 

 land. Subaerial and lacustrine sediments are usually distinguish- 

 able from those made in the sea by their fossils, and sometimes by 

 their distribution. 



Fig. 266. Cross-bedded sandstone, Dells of the Wisconsin. The strata are 

 horizontal. The laminae within each stratum dip notably. (Atwood.) 



Topography of shallow-water deposits. The shallow-water 

 deposits have, on the whole, a rather plane surface, though there 

 are some notable departures from flatness. The steep slopes of the 

 delta fronts and of wave-built terraces have already been spoken 

 of. Barriers often shut in depressions, and the disposition of the 



