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was taken out of the Ochre Pit. T have a large mass nearly 

 of this description, found in the mixed Lime and Sand 

 Stratum under the Thames at Rotherhithe, of which I do 

 not know that any one else has preserved a specimen. This 

 and others are more or less cemented by Lime and Oxide 

 of Iron. We have, therefore, three remarkable formations 

 in the Sandy Stratum, which may prove highly instructive. 



