Tully Limestone. These beds vary in thickness from 300 
to 7oo feet. The kinds that are most persistent are shale, 
sandstone and slate, usually occurring in the order men- 
tioned, although the variety of ways in which they are 
combined makes it a difficult matter to try to enumerate 
their order of succession. 
Where the division between this group and the preced- 
ing is most marked, we find that the lower layers are a 
dark and somewhat slaty shale, which in some places con- 
tains a few feet of dark colored limestone. This shale is 
usually quite fossiliferous. It crops out just northeast of 
Skaneateles, on the road between that place and Marcellus, 
and again just north of Pompey Hill. As we move farther 
toward the south we find that this shale has changed to a 
less fissile and more calcareous shale, by which it is over- 
laid. The latter has sometimes been called the Skaneateles 
Shale, although the name is not generally recognized. 
Even when used it has sometimes been made to designate 
various parts of the group, or even the entire group. We 
next come to a much harder variety of shale, also fossilifer- 
ous, which in its turn is overlaid by a hard layer of sand- 
stone. In some places this appears as a shaly sandstone. 
Its color is usually brown, and where weathered a yellow- 
ish brown. Lastly, this sandstone is overlaid by another 
hard variety of shale, which completes the group. These 
divisions are not always easily distinguishable, nor are 
they persistent for the entire county. The enumeration 
applies more particularly to the eastern part in the towns 
of Pompey and Fabius. Toward the western part of the 
county there is more calcareous and less arenaceous mat- 
ter. The whole situation may be easily summed up by 
saying, that while the shales and sandstones predominate 
an occasional layer of limestone is found, 
For delightful field study there is no group in our 
county as interesting as the one under consideration. 
39 
