4.13 
surface of the stratum. The points of some of the nails, as 
may be seen, are remarkably sharp and distinct ; and the 
alternate impressions of the right and left foot may be ^dis- 
tinguished. From some of the marks, backward, in the 
direction of the track, are indented lines scooped out, as 
though the feet had been drawn along the surface of the 
sand. 
On carefully comparing these with the specimen obtained 
near Brighouse, I had the satisfaction to find an exact cor- 
respondence in the form of the foot. 
In the early part of the year 1840, I found slabs of stone 
at Hill Bridge, near Owlerton, having upon them impressions 
similar to those already described. There are also marks 
upon them having the appearance of being caused by a heavy 
shower of rain, besides others for which I am unable to 
account. Between the slabs are occasionally found fronds of 
ferns, and also Calamites and Stigmaria, very much com- 
pressed. The stone is a hard silicious sandstone, approach- 
ing to the nature of calliard or gannister, with which the 
neighbourhood abounds. The laminse are close and even. 
The beds vary in thickness from one and a half to ten inches. 
These stones are much used for flagging the streets here, 
(Sheffield,) and have, no doubt, attracted the attention of 
many persons by the singular inequalities of the surface. 
The foot-marks are not always present, nor are they then 
easily distinguishable, except by comparison with the other 
specimens, when they are found, in form and size, entirely to 
agree. 
In May last (1841) I found upon the moors at Fullwood 
Head, five or six miles west from Sheffield, some beds of 
brown sandstone, covered with foot-prints, and also with what 
appear to be the tracks of worms — (No. 4) — the surfaces are 
otherwise exceedingly smooth and even. The beds vary from 
two inches thick down to one-sixteenth of an inch, and both 
