PLATE V. 



Map of tract along Spuyten Duyvil Creek, at extreme northern 

 end of Manhattan Island. The dark broken band indicates the out- 

 crops of the layer of dioritic schist. The figures show the strike 

 and dip as observed in the outcrops of the schist and gneisses. The 

 dotted line at 216th Street represents the position of the cross-section 

 shown in Plate VI. 



(444) 



