COLUMBIAN HISTORICAL EXPOSITION AT MADRID. 



103 



felsite (fig. 17), quartzite (fig. 18), and hard clay slate. These are found princi 

 pally on the Atlantic seaboard from Massachusetts to Georgia, though they have 



Fig. 17. 



RUDE NOTCHED AX. 



District of Columbia. Quartzite. Half natural size. 



Fig. 18. 



RUDE NOTCHED AX, PORPHYRITIC FELSITE. 

 Ki.leigh, N. C. 



been found in the West. They may have been the precursor or ancestor of the 

 grooved stone axe of North America. 



