342 RED PRIMARY SANDSTONE. 



B. Quartz and felspar, with blue schistose clay 

 and mica, or quartz alone, with the two latter ingre- 

 dients. 



This variety is more or less laminar, and 

 passes into the micaceous graywacke which also 

 alternates with the primary sandstone. 



FOURTH DIVISION. 



With a coarse structure: sandstone conglo- 

 merate. 



* 



A. Fragments of quartz and felspar firmly united 

 by crystalline quartz. 



B. Quartz, felspar, and hornblende, similarly 

 compacted. 



C. Quartz, and felspar, with fragments of jasper. 



D. The same, with fragments of schist, or with 

 both. 



E. Distinct fragments of gneiss, and of granite, 

 firmly cemented by solid quartz. 



F. The same substances in greater or less num- 

 ber, with so large a proportion of schist as to pass into 

 a conglomerated graywacke, under which it may also 

 be equally ranked. 



These different compounds present a great 

 diversity of aspect, and are e,i}umjerate4 here as 

 well as under the head of conglomerates, for the 



