XVII 



SYNOPSIS 



247 



First Order of the Hypersthene-Augite Andesites. 

 Characters. — Felspar-lathes not in flow-arrangement. 



Formula. — Hypersth.-aug., matr., non-flu. 



Sub-order. 



Pyroxene 



of the 



groundmass. 



Section. 



Presence or 

 absence of plagio- 

 clase phenocrysts. 



Genus. 



Species. 



Character 



of the 



phenocrysts. 



Length 



of felspar 



lathes. 



Number of 

 specimens. 



I. 



Granular 

 {gran.) 



2. 



Prismatic 

 (prism.) 



3- 



Ophitic 

 (oph.) 



Plagioclase 



phenocrysts 



{fhen.) 



No pl^ioclase 

 phenocrysts 

 (non-phen. ) 



3. Phen. 



4. Non-phen. 



Glassy plagioclase 



phenocrysts 



(vitr. ) 



Opaque phenocrysts 

 of plagioclase 



•02- 

 •I- 



-*I mm. 

 •2 „ 



[opac.) 



Large phenocrysts 



of pyroxene, over 



2 mm. {magn. ) 



Small pyroxene 



phenocrysts, under 



2 mm. , or none 



(parv.) 



■3— 'S mm- 



{■°:- 



■02- 

 •I- 

 •02- 

 i- 



1 mm. 



2 „ 



I mm. 



'2 „ 



12 

 4 



/ Not repre- 

 ^^ sented. 



' Not repre- 

 sented. 



Not repre- 

 sented. 



/ Not repre- 

 \ sented. 



