15g THE STONE AGE IN NEW JERSEY. 
phyry, and has been very carefully chipped and ground fi 
water-worn pebble such as are now so very abundant in the bed” 
and along the shores of the Delaware River, at and, below 
ton, N. J. Prof. N 
(vide ‘Stone 
Scandinavia”) vou 
Fig. 18. 
pear to us how a 
/ Natural size. 
and one-quarter inches; its thickness at the commencemé 
the polished surfaces one and _ three-eighths inches. 
small axe, of rare shape, is 
that figured next (Fig. 19). It 
is of a fine grained porphyritic 
stone and has been polished 
over its whole surface. Its di- 
mensions are nearly the same 
as the preceding, though it is 
not quite as wide as the for- 
mer. The cutting edge was o- 
riginally good. The back has 
a ridge running obliquely across 
it, from which the surfaces 
slope at angles of forty-five 
degrees. Had this been used 
as a wedge for splitting wood, 
certainly the back is not favor- 
ably fashioned for receiving a hard blow; 
in that case would have been much battered, in this § 
still in moderately good state of preservation. This ¢ c 
condition of the backs of axes is not unfrequent 4 
