MAP OF THE 



ALTERED UPPER DEVONIAN 



Or BERNAR.DSTON 

 AND NORTHFIELD MA 55. 

 AND S VERNON VT. 



mm 



£23 Argi&iie 



a. Main quarry ; I. Thickest bed of magnetite ; c. Excavation connecting lime- 

 stone with quartzite ; d. Excavation exposing fault of mica schist against lime- 

 stone; e. Same as d; f. Contact of quartzite on argillite. 



