CLINTON .GROUP. 37 
but apparently by some body being drawn over the surface after they were made. The upper 
portion of the righthand series is preserved in its integrity, or without subsequent pressure or 
abrasion. 
Figs. 3 & 4, are parts of two different slabs, covered by numerous small tracks, scarcely one 
of which presents the dactyloid character of the first ones. They are sharp, distinctly marked 
pits, with elevated ridges of sand behind them or obliquely upon one side. Some of them have 
a triangular form, as in the lower part of fig. 3. In the upper part of the same figure, the im¬ 
pressions are nearly obliterated, but were originally small and very numerous. 
These figures present nearly all the variety which has been observed in the. specimens col¬ 
lected. A more thorough examination would doubtless bring to light a greater variety. I have 
been unable to visit the locality since my discovery of it in 1847 ; and at that time, owing to 
the difficulty of access, was able to bring away only some of the better specimens of these and 
other tracks, leaving behind a large number of others. 
Position and locality. The tracks of this character have been found most abundant in the 
ravine below Tisdale’s sawmill in Warren, Herkimer county. Their position is near the centre 
of the group at this place. The rock in which they occur is a coarse sandstone, sometimes with 
considerable intermixture of shaly matter. Similar markings, though less distinct, have been 
observed at intervals in a western direction as far as Flamborough Head, Canada West. 
(State Collection.) 
NOTE. 
Wishing to present the opinions of other naturalists regarding these peculiar markings upon 
the surface of the strata, I wrote to Sir Charles Lyell, enclosing several of the plates then 
complete. These plates were submitted to Professor Forbes : his remarks on them are as follow: 
“Plants.” The conclusion that these bodies are plants, seems to me very question¬ 
able. 
“Tracks of Gasteropoda .” Fig. 4 has to me the aspect of a gasteropodous track, and 
so has fig. 3. Figs. 1 a & b seem rather to be the trails of a planarian worm allied 
to Nemerta. 2 a & b do not seem organic. 
The markings on these slabs look remarkably like those made by many crustaceans : 
so do some of those on pi. 16. In fig. 1, the tracks to the right hand are remarkably 
like those made by certain fishes. I have seen similar markings in the tilestones in 
W ales. 
Prof. F orbes is probably better acquainted with the character and origin of such markings, 
than any other person. The inspection of the actual specimens would doubtless enable him to give 
a more decided opinion, and perhaps to modify to some extent the views expressed regarding 
those on Plates 15 and 16, which are clearly all due to a similar cause. 
Plat£ 10 : 
Plate 11 : 
Plate 15. 
