COBBLES 



GRAVEL 



Coarse I Fine 



SAND 



Coarse) Medium Fi ne 



SILT and CLAY 



Mesh Open i ng - Ins 



Sieve Sizes 



Hydrometer Analysi s 



100 



90 



80 



70 



a eo 



40 



30 



20 



76 32 142 44 10 16 20 30 406080140200 





















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100 50 



10.0 5„0 l„0 0.1 0.05 



GRAIN SIZE IN MILLIMETERS 



0.01 0.005 0.001 



Figure 18. Grain size distribution curves for crushed and natural cal- 

 careous sand from Florida. 



63 



