PLATE VI. 



Cross-section of beds on slope from Spuyten Duyvil Creek up to 

 crest of Invvood Ridge. The dark layer of dioritic schist, display- 

 ing two anticlinal folds, is intercalated in micaceous gneiss. Toward 

 the crest the lowest bed of pegmatitic gneiss is indicated by the 

 broken lines. 



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