COBBLES 



GRAVEL 



Coarse Fine 



SAND 



Coarse Medium 



Fi ne 



SILT and CLAY 



Mesh Opening - Ins 



Sieve Sizes 



Hydrometer Analysis 



7 6 3 2 1*2 ? t 10 16 20 30 MO 60 80 IMP 200 



100 50 



l 0o 5.0 1.0 0.1 0.05 0.01 0„005 0.001 



GRAIN SIZE IN MILLIMETERS 



Figure 17. Grain size distribution curves for crushed and natural cal- 

 careous sand from Guam. 



62 



