4:6 DOMAIN VIII. DIAMICTONIC. 



NOME VIII. BASALTIN, WITH SILEX. 



[EBENSINITE, from Eben Sina, or Avicenna, 

 A. D, 1020.] 



The siliceous part is generally felsite. Ba- 

 saltin sometimes passes into a more siliceous 

 substance, which, in the north of Ireland, is 

 schistose, and contains ammonites. It is sup- 

 posed to be a detritus of the basal tin, mixed 

 with siliceous particles in the primeval waters. 



NOME IX. BASALTIN, WITH WACKEN. 

 [ALBERTITE, from Albertus Magnus, A. D, 



This combination sometimes occurs in Sax- 

 ony, and other basaltic countries. But far more 

 generally the basaltin is separated from the 

 wacken by a positive line. 



