70 MARSUPIALIA. 
The subjoined cut, from Dr. Fitton’s paper on the strata 
from whence the fossil jaws of the Amphitheria and Phasco- 
lotheria were obtained, represents the section of the super- 
imeumbent beds, taken through a shaft sunk to a pit or 
gallery in which the “ slate,” (as it is called,) is worked. 
On the side opposite the right hand is marked the depth 
of the shaft to the horizontal gallery where the slate is dug, 
which contains the Mammalian fossils; on the opposite 
side, the strata are numbered in succession as follows :— 
Rubbly limestone (Cornbrash). 5. Oolitic rock. 6. Blue clay. 
. Clay, with Terebratulites. 7. Rag, or oolitic limestone. 
. Limestone rock. 8. Sandy bed, containing the “ Stones- 
Blue clay. field slate.” 
Per 
