in the Cortlandt Series. 



127 



1881. Contains andesine, augite, hypersthene, biotite, apatite 

 and magnetite. Symbol, II. 5.3.4. Andose. 



JB. Angite peridotite (olivine pyroxenite) from Monlrose 

 Point. Analysis by W. H. Emerson, for G. H Williams, tbis 

 Journal (3), xxxi, p. 40, 1S86. Contains augite, hypersthene, 

 bornblende, olivine, magnetite and pyrrhotite. Symbol, IV. 2.1.2. 



C. Norite, from 1^ miles sout^ of Peekskill. Analysis by G. 

 S. Rogers. Contains ortboclase, andesine, bypersthene, a little 

 biotite, apatite, ilmenite and magnetite. Symbol, II. 5.3.4. 

 Andose. 



D. Biotite norite, 2 miles east of Montrose Point. Analysis 

 by G. S. Rogers. Contains ortboclase, labradorite, biotite, 

 hypersthene, apatite, ilmenite and magnetite. Symbol, II. 5.4.3. 

 Hessose. 





A. 



B. 



C. 



D. 



SiO, 



55 34 



47-41 



51-49 



46-10 



A1A 



16-37 



6-39 



20-72 



18-66 



Fe 2 3 



•77 



7*06 



1-80 



3-00 



FeO 



7-54 



4-80 



7-28 



9-58 



MgO 



5-05 



15-34 



3-82 



6-71 



CaO 



7 51 



14-32 



6-71 



8-26 



Na 2 



4-06 



•69 



3-70 



2-57 



K 2 



2-03 



1-40 



2-14 



1-59 



11,0 + 



•58 



2-10 



•31 



•18 



H 2 0- 









•10 



•10 



TiO, 









2-26 



2-88 



PA 







■15 



•70 



MnO 



•40 





•13 





BaO 



_ 





tr. 



tr. 



S 







•49 



•11 



•18 



Sam 



99-65 



100-00 

 Norms* 



100-72 



100-51 





A. 



B. 



C. 



D. 



or 



12-2 



8'3 



12-2 



94 



ab 



34-1 



5-2 



30-9 



21-5 



an 



20-3 



10-6 



32-5 



34-8 



C 











•5 





di 



14-0 



47-9 





5-0 



% 



11-4 



6-7 



13-8 



3-0 



ol 



5-3 



8-6 



29 



15-9 



mt 



1-2 



10-2 



2-6 



4-4 



il 



. _ , . 







4-2 



5-3 



ap 







.... 



•4 



1-2 



JSTow if the simpler norite be not quite so fine-grained it will 

 not be entirely pure ; and this is the ease in most places. 

 In fig. 1 the mass of the rock is a biotite-augite norite, while 



