these and other smaller bowlders, which one will find in 
the surrounding stone fences, a representative collection 
of this period’s fossils can readily be obtained. 
In the bluff east of the Glenside Mills, Skaneateles, 
this rock again occurs. At this place itis about twenty 
feet in thickness, but since the exposure isin a bluff which 
is not easily accessible, it does not form as favorable a 
place for collecting specimens as some of the other places 
mentioned. Another exposure will be found in the south- 
ern part of the town of Elbridge, where the sandstone is 
about thirty feet in thickness. This represents the maxi- 
mum thickness exposed anywhere in our county. The 
other extreme will be found in Manlius, where the rock is 
but a few inches in thickness, or at Split Rock, where it 
has almost entirely disappeared. 
The following fossils are found in this period: 
BRACHIOPODS. 
Spirifer arenosus, a large and course brachiopod is the 
most abundant. The spirifer itself is not very common, 
but the cast is extremely so. Almost any large piece of 
the sandstone, chosen at random, when broken open will 
teveal parts of it. Although the spirifer and its cast are 
perceptibly different, they would not be mistaken for dif- 
ferent genera or species. 
The Orthis hippiraonyx is another bivalve of common 
occurrence, although not as abundant as the preceding. 
The lower valve bears a striking resemblance to a colt’s 
foot, and is commonly called by that name. 
The Orthis musculosa, another species of the same 
genus, is usually smaller than the preceding, and not as 
abundant. 
The Merzsta lata is another brachiopod which is plen- 
tiful but not abundant. The casts of this specimen are 
quite unlike either of the valves, which are also slightly 
different. 
25 
