MODE Vni. ARGILLACEOUS GI.UTENITE. 297 



simple subsidence, but implies a " refoukment en 

 sens contraire, which has broken and raised beds 

 originally horizontal." ] 166. 



A fine argillaceous sand-stone, speckled with 

 mica. 1442. 



The beautiful pierre de Moravie seems of this 

 kind : it is white, with purple lines *. 



* Gallitzen, Recueil des Norm des Mineraux, Brunswick 1801, 

 4to. Bom mentions a sand-stone of Siberia, containing nodules of 

 malachite. In Thuringia a sand-stone is found which is worked as 

 an ore of copper; and it also contains silver, cobalt, and lead, 

 Brongn. ii. 224. 



