Review of the New York Geological Reports. 55 
‘| ‘By ‘nsouasn 
“aVuNoy ‘srumsofinsun ndhayy “f “B14 
“pgt ‘d Gaoday s,wexnuy, 
shy Jo weg “Gg (‘Wwaxaxv, ‘snuroid rhuorsnddizy) 
Casts are of more frequent occurrence than perfect fossil shells, 
as is apt to be the case both in sandstones and magnesian lime- 
stones. One of these, fig. 4, from its strong resemblance to a 
colt’s foot, has been called by Vanuxem, Hipparionyr proximus, 
believing it to be a genus intermediate between the oii Stro- 
phomena, Orthis and Pentamerus. 
None of these forms, as far as we know, have been discovered, ei- 
ther in the western U. S. or England. _ It is remarkable, however, 
seeing that no other rocks of like lithological character are found in 
the upper or middle part of the New York system, that there ex- 
ists at the falls of Fall Creek, near the central part of the State 
