66 



NEW YORK STATE MUSEUM 



K2O 24 3 I 



^ — =<; — > — = Lassenose 



NaoO 80 5 7 



Mode 



Qtz 



Or 



Ab 



An 



Mgt 



Heminite. . 



Biot 



Extra AUG . 



0- 

 II 



12 



41 



92 



8 



34 





43 





15 



3 



02 



1 



53 



Biotite 



a 3 H.O. Fe203.4Si02 

 4 K.0 . 4 AI.O3 . 8 SiO., 

 8 FeO . 4 SiOa 



Plagioclase = Ab;, Ann = Oligoclase 



Analysis and recast by G. Sherburne Rogers 

 Analysis 6945 



Mohegan granite 



SiOz. . 

 AI2O3. 

 FejOs. 

 FeO.. 

 MgO. 

 CaO.. 

 NajO. 

 K.2O.. 





No 



rm. 



Or. 



Ab. 



An. 



Cor. 



Mgt. 



Hyp. 



73 32 



I .221 



234 



4'4 



48 







17 



15 



I 



01 

 47 

 19 



15 



147 



3 



17 



3 



39 



69 



24 



15 



3 

 3 



14 



3 



I 



35 



24 







24 









4 



2-j 



69 





69 











3 



72 



39 



39 













Q. 



Q Quartz =30.48 

 fOrth. =21.68 



F ] Albite =36.16 



[ Anorthite = 66 . 67 



C Corundum = i . 53 



A I Magnetite . 70 



P. Hypersthene 2.15 



Femic 



85 



Salic 96 . 52 



Sal 96 7 



= — = > ~ = I Persalan c 



Fern e i 



Q 30.5 31 



— = or ^L - > -^ 4 Brittanaine 



F 64.6 5 7 



iNaaO+KoO 108 7 5 



= — or <^ - >. - = 2. Toscanase 



CaO 24 I 3 



K2O 39 3 I 



or <; - > - ^ 4. Lassenase 

 Na20 69 5 7 



Lassenose (symbol 1.4.2.4) 

 Near Toscanose 



Analysis and recast by G. Sherburne Rogers. 



Cortlandt series. The geology of the Cortlandt series has been 

 worked out in considerable detail by G. S. Rogers.^^ 



^* Geology of the Cortlandt Series and Its Emery Deposits. Rogers, G. 

 Sherburne, Annals, N. Y. Acad. Sci., v. 21. 191 1. 



