Natural and Artificial Terraces. — Peet. 113 
these forms we find a representative in these Hereynian species in 
the B. dormitzeri var. applanatus Novak. On the whole the com- 
parison of the Hereynian trilobites discusssd by Dr. Novak with 
their American equivalents brings out several important points of 
correlation with our typical Silurian ( Niagara), some with the 
Lower Belderberg, but most emphatically with the limestone fau- 
nas of the Upper Helderberg. 
NATURAL AND ARTIFICIAL TERRACES. 
By Stephen D.Peet, Ph. P.. Mendon, III. 
The subject introduced by the title given above lias been 
discussed in the pages of the American Antiquarian until the 
danger of dogmatism on both sides suspended it, and the advice 
was given, let us seek for more facts. It may seem a puerile 
■enquiry but the writer presumes upon the candor and charity of 
the geologists to put the case briefly before them for further 
examination. 
It might here he stated that Ohio is the state in which archaeol- 
ogists have claimed that they have discovered artificial terraces, 
but it is also the state in which natural terraces are very numerous, 
some of which are quite likely to he mistaken by unskilled ob- 
servers for artificial works. The first case of this kind which has 
gone into any record was that which has now become very 
familiar, namely the well known terraces at the southwest corner 
of the enclosure at Ft. Ancient. The authors of that extremely 
valuable book. ■• Ancient Monuments," Messrs. Squier and Davis, 
maintained that this terrace was a platform placed on the escarp- 
ment for the sake of defending the fort from attack and For the 
sake of keeping a watch of the river bank which is still so 
plainly visible from the spot. These artificial ten-aces are laid 
down on all the maps and diagrams of the fort and very lew have 
undertaken to correct the error for the very reason that il is still 
uncertain whether it is :m error or a correct observation. Still in 
reference to these platforms we may say that every attempt to 
prove them artificial has, to our mind, brought out more clcarh the 
proofs that they were natural. To illustrate — Mr. Warren K. 
Moorhead in his recent hook on Kort Ancient mentions the ter- 
races and then goes on to say that terraces similar to these are 
