415 
pressions made, as if by drops of water, continue without in- 
termission through all the laminae of which the stratum is 
composed. I think it very improbable that heavy rain con- 
tinued to fall sufficiently long to produce the phenomenon ; 
and from the additional fact that these impressions were 
found to cover but a very limited space, I am inclined to 
think that they were produced by droppings from the leaves 
and branches of some of those plants or trees, which at that 
period so thickly covered the surface of the earth. 
In the month of November last, I obtained possession of 
a stone, which I know, from practical experience, to be from 
the neighbourhood of Thornset quarries, about 10 miles 
N.W. from Sheffield. (No. 7.) I had not the advantage of 
finding it in situ ; nor have I been able since to visit the 
quarries in tha't neighbourhood. The stone is similar to that 
from Fullwood Head, excepting that the beds are thicker, 
and the scales of mica not so numerous. The little animal, 
whose feet-marks are upon it, is the one already so often 
mentioned. The impressions are deep ; and it is remarkable 
that the same prints pass through many laminae, appearing on 
the lower surface as reliefs. The specimens may be multi- 
plied by splitting the stone. 
Still more recently, on the 29th December last, 1841, 
I discovered abundant foot-prints of the same reptile, in 
a quarry recently opened, at Whirlow Bridge, on the edge 
of Dore Moors. (No. 9.) They are on a dark coloured, 
micaceous shale, very soft, and thin ; they lie near the sur- 
face. The subjacent beds are covered with ripple marks, 
but have no foot-prints : the strata dip at about 25° to the 
East. During the same week, I found other similar impres- 
sions at Clough Field, about 1^ mile west of Sheffield, on 
smooth, thick, light-coloured flag-stone ; but in this instance 
they are not numerous, though well preserved. 
I have avoided, hitherto, any conjecture as to the character 
Q 
