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28o 



ILLUSTRATIONS OF THE 



th 



fand-pit ; a clrcumflanc 



appears to 



fid 



however, at the bottom of 



fing 



It 



e 



hill, that h 



met with the appearances which chiefly attraft 



d h 



notice : " f ird," fay 



h 



ii 



ck bank of quartz y fand, ab 



or lowell 



bed of clay, then a bed of the argillaceous ftone 



d wacken, and upon this lall refted the ba- 

 5." " When I axw," adds he, ** the three firft 



beds running almoft horizontally under the ba^ 



fait 



faltes, and forming its bafe 



the fand becoming 



finer above, then argillaceous, and at laft chang 

 ing into^real clay, as the argil was converted 



acken 



perfect 



baf 

 nfiti 



fuperior part ; and, laill 



word, when I found 



fro 



fand, from 



P 



fand to 



arg 



from 



the latter to a fandy clay, and 

 fandy clay, through many gradations, 

 to R fat clay, to wacke, and at laft bafliltes, I 

 was irrefiftibly led to conclude, that the bafaltes, 

 the wacke, the clay, and the fand, are all of one 



d th 



fame format 



d that they 



the efFed: of a chemical precipitation during 

 and the fame fubmerlion of this country *." 



Fivft, 



Comb 



Tin e 



pais 



banc (it fable quart^e^ix, puis au-defTus une 

 couchii d'argikj enfin une couche de la pierre argiieufe 

 nominee Wacke, et fur celle-ci repofer le bafalte, Quand 



ie 



