

THE EEGOLITH 



Chemical Analyses of Steatified Clays 



Constituents 



Silica (Si02) 



Alumina (AI2O3) • . . 

 Phosphoric acid (P2O5) . 

 Titanic oxide (TiOa) . . 

 Ferric iron (^6203) . . 

 Ferrous iron (FeO) . . 

 Manganese oxide (MnO) . 



Lime (CaO) 



Magnesia (MgO) . . . 



Potash (K2O) 



Soda (NaaO) 



"Water (HsO) 



Carbonic acid (CO2) . . 

 Organic carbon (C) . . 

 Sulphuric anhydride (SOg) 



I 



II 



III 



IV 



56.17 % 



10.98% 



40.22 % 



48.81 % 



24.25 



8.66 



8.47 



7.54 



Not det. 



Not det. 



0.05 



0.13 



Not det. 



Not det. 



0.35 



0.45 



Not det. 



Not det. 



2.83 



2.53 



3.54 



6.191 



0.48 



0.65 



Not det. 



Not det. 



Trace 



0.03 



2.09 



1.02 



15.65 



11.83 



2.57 



2.19 



7.80 



7.05 



4.06 



1.12 



2.36 



2.60 



2.25 



0.75 



0.84 



0.92 



4.69 



3.65 



1.952 



2.02 2 



None 



None 



18.76 



16.47 



None 



None 



0.32 



0.38 



None 



None 



0.13 



0,05 



99.62% 



33.56% 



100.21 % 



100.46% 



Salt-wafer Marsh, or Paludal Deposits. — Related to the delta 

 deposits already described, but differing in that their inorganic 

 materials are in large part derived immediately from the sea, are 

 the salt-water marsh, or paludal deposits so common along the 

 Atlantic border of North America. In discussing the formation 

 of these and their gradual transitions into arable lands, one can- 

 not do better than follow Professor N. S- Shaler,^ 



The formation of a sea-coast swamp is due mainly to wave 

 action and plant growth, and is dependent upon the configura- 

 tion of the coast. Wave action upon an irregular coast such 

 as that of New England nearly always results in a breaking or 

 wearing away of the exposed headlands and the transportation of 

 the debris into intervening inlets, where it is thrown upon, 

 or at least in a direction toward, the beaches. On these beaches 

 the rock fragments are ever being ground smaller and smaller, 

 and must in time be reduced to the condition of the finest sand 

 and mud. Each incoming wave hurls more or less of the frag- 

 mental material upon the beach, whence a considerable portion 



^All iron determined as PeO. 



^Contains H of organic matter dried at 100 C. 



'Ann. Eep. Director of the U. S. GeoL Survey, 1884-85. 



