CLARK : C4LACIAL SECTIONS. 
427 
Waller, B.Sc , of Birmingham, and myself, the results showing 
respectively 58 % and 61 % when all reduced to Manganese 
dioxide. 
The following is one section of these variable beds : — 
Surface soil, and red loamy clay 
Feet. 
Unbedded gravels, &c. 
5 
Horizontal beds of sand, clay, &c 
3 
Loose gravels ... 
14 
Layers of gravels, highly inclined 
Gravels, with Maganese Sesquioxide 
2 
Pebbles and gravels, encrusted with Manganese 
dioxide ... ... ... 
H 
Pebbles, with Manganese Sesquioxide, then Orhreous 
2 
Total ... 
25 
The excavations do not reach the true boulder clays, and 
there are no signs of brick clays. 
Crossing the river we have the corresponding, but rather 
more elevated beds along the Bishopthorpe road ; and here, be- 
tween Campleshon pond and Knavesmire, occurred a similarly 
situated bed of Manganese, with an Ochreous band below. 
There was also a second thin band among the ochre, about 4 feet 
from the first, which was about 10 feet below the surface. In a red 
and warpy clay, 4 feet above the Manganese, were seme other 
black lines. But the Microscope showed that these were due to 
particles of coal dust and micaceous sand. Between the Man- 
ganese bands a few scratched stones were picked out, and one 
block had been removed measuring 2x2x1^ feet. 
These pits are now obliterated ; but at fresh ones, a few 
hundred yards lower down the river, sections are constantly ex- 
posed. Here I had the good fortune to obtain a well preserved 
bone, identified as the metatarsal of Ursus spelceus, or the Grizzly 
Bear.* It was found by the workmen at the base of the bottom 
* On the authority of W. Davies, Esq. , of the British Museum, and Professor 
Boyd Day kins, Manchester. 
