719 
The tunnel driven through Big Lick Mountain, at the Summit Branch 
Colliery at this place (Williamstown), furnished me at one time with a 
specimen of more interest, if possible, than the saurian foot-marks from the 
Mahanoy Valley, being no less than a sandstone cast of the head of the 
thigh bone of some animal that had evidently been of large size, the cast 
having been over fourinches in diameter, and nearly ten pounds in weight. 
It was presented to me by Mr. Daniel James, the foreman of the gangs of 
men driving the tunnel from the southside. He could not find a trace of 
the other portion, as it had been thrown out by a blast, although he 
searched carefully. In appearance the cast had a striking similarity to the 
head of the femur in a human skeleton and was almost perfect, owing to 
its great hardness and the hard character of the surrounding rock, some 
of which clung to it most tenaciously and could not safely be removed by 
hammer and chisel. Unfortunately it went astray by getting into the 
hands of some unprincipled individual during transmission to the Society 
of Natural Sciences at Reading, to which my design was to present it, and 
only the memory remains. ' 
This most interesting cast was from a ‘‘slip,’’ in excessively hard rock 
lying north of what is here known as the ‘‘ Whites’’ vein or seam of coal, 
-hundreds of feet beneath the mammoth, but overlying the Lykens Valley 
seam. As I preserved no record or drawing of this find, it is only by a 
draft upon memory to give an indistinct idea of it in a rude drawing as 
TAS Solas Teas 
The cast was a fine-grained, very compact sandstone, wholly different 
in texture and color from the surrounding rock of the ‘‘slip,’’ which was 
over a hundred feet beneath the surface of the mountain and several hun- 
dred yards from the southern opening of the tunnel, so that, without an 
opening to the surface, which there was not, it could not reasonably be 
suspected to have been the remains of an animal dropped in from the sur- 
face. This was in the summer of 1872, but the impression it then created 
was very strong and its appearance still remains vivid in memory. 
Respectfully, &e., 
WM. D. H. MASON. 
WILLIAMSTOWN, DavuPHIN Co., April 4, 1878. 
Prof. Prime exhibited photograph pictures of limestone 
(Siluro-cambrian) outcrops along the west bank of the Le- 
high River above Allentown, which evidently verify Prof. 
Rogers’ hypothesis of the cause of the general south-east 
dips which prevail through the Great Valley. In these pic- 
tures a number of local sharp overthrown anticlinal rolls or 
saddles are beautifully exhibited. 
Prof. Frazer remarked that he had just completed his 
Susquehanna river section in Lancaster County, through 
