ROGERS, GEOLOGY OF THE CORTLANDT SERIES 



65 



21. Brown Norite, Buckbee Mine. Analyst, G. S. Rogers. Symbol, IV. I 1 . I 1 . 2. 



Cookose. 



22. Sillirnanite Schist, Dalton Mine. Analyst, G. S. Rogers. 



23. Manhattan Schist. Composite analysis of five specimens from various points 



beyond the borders of the series. Analyst, G. S. Rogers. 



24. Manhattan Schist (least altered), Crugers. Analyst, F. L. Nason. G. H. 



Williams (3), XXXVI, p. 259. 



25. Manhattan Schist (nearer contact), Crugers. Idem. 



26. Manhattan Schist (about 750 feet from contact), Crugers. Idem. 



27. Manhattan Schist (on contact), Crugers. Idem. 



Modes. 



21. 



22. 



23. 



Qtz 



Orth 



Albite 



Anorth 

 Muscovite .. 



Biotite 



Bronzite . . . 

 Cordierite.. 

 Sillirnanite. 

 Corundum.. 



Mgt... 



Ilmenite . . . 



1.1 



7.3 



10.3 



75.4 



3.5 



.8 



1.7 

 6.3 



17.9 

 37.3 

 15.9 

 14.4 

 5.1 



19.2 

 5.6 



14.7 

 2.5 



38.5 



14.9 



.7 

 1.9 



