CHEMICAL COMPOSITION OF MARINE SOILS 



49 



Table V 



Chemical Composition of Soils Deposited by Water. 

 Complete Analyses 



Coastal Plain Soils of Maryland 



1. Insoluble 



2. Silica (Si0 2 ) 



3. Alumina (A1 2 3 ) 



4. Ferric iron (Fe 2 3 ) . . 



5. Ferrous iron (FeO) . . 



6. Sulfur trioxid (S0 3 ) . 



7. Phosphoric acid (P 2 5 ) 



8. Lime (CaO) 



9. Carbon dioxid (C0 2 ) . 



10. Magnesia (MgO). 



11. Soda (Na,0) 



12. Potash (K 2 0) 



13. Water 



14. Organic matter 



15. Volatile matter 



3.2<a 

 Hgo 

 A F a 

 S o S? 



Is 



tO~^ *J . 

 W O B to 



j^O cS tu 



II 



III 



c3 rf C to 



a -a i 



a> 



- " a 3 



^ t-. ki 



5-2 - 



o S-o ft 

 0C g 



Lil 



' O * 





O O 



fc* 



Pea* 



80.55 

 8.82 

 2.67 



0.07 

 0.42 

 0.47 

 0.05 

 0.29 

 0.49 

 1.22 

 1.28 



3.26 



V 



a a 



u . 



ca a 

 pq o 



Si 



Ph O 



s * 



94.32 

 2.66 

 1.25 



0.02 

 0.04 



6.07 



0.11 

 0.12 



1.21 



sequently the accumulated soil is a fine, friable loam 

 rather than a clay. Heavy alluvial clay is seldom found 

 outside the larger river bottoms and generally in 

 depressions remote from the channel. 



Another source of heavy soil is ponds formed by the 

 cutting off of bends in the channel. These "ox-bow 



D 



