18G8.] MAW VARIEGATED STllATA. 375 



Total iron, Soluble 2-46 1 „ pm 



„ Insoluble y.^3|2-G9pcrccnt. 



^Sesquioxide of iron S-OO „ 



I Protoxide of iron 0'41 „ 



Present as ■{ Oxides of iron weighed as "I . i v i /•» on 



1 protoxide ." } insoluble 0-29 „ 



1, Carbon 0-188 „ 



The discoloured scams and pockets (Analysis No. G8) contained 



Total iron, Soluble 0581^^-0 



„ Insoluble 0.^5 J0-/3 per cent. 



(Sesquioxide of iron 055 „ 



Protoxide of iron, soluble 0*25 „ 

 Oxides of iron weighed as 1 . , , , r\nr\ 



protoxide t j insoluble 0-20 „ 



Carbon 0-114 „ 



The disposal of the oxides of iron which in this case have been 

 withdrawn from the bleached portions is not evident; but in an 

 example pointed out to me by Mr. J. "W. Young, of Glasgow, the 

 iron has been aggregated as hydrous sesquioxide into tubular con- 

 cretions (lig. 47, a, b, c) concentrically disposed around roots pene- 

 trating the Post-tertiary clays about Glasgow, their transverse section 

 ((I) exhibiting a banded arrangement. 



Fig. 48. — Bleached sand under 

 peaty gravel. Cliff east of 

 SoutJmold, Siffolk. 



Fig. 47. — Concretions of hydrous 

 sesquioxide of iron, Post-tertiary 

 clays, Glasgoiu (actual size). 



In the cliff between Southwold and Easton-Bavent, in Suffolk 

 (fig. 48), a surface layer of peaty gravel has bleached the bright- 



