APPENDIX. 
157 
1. Alluvium. 
8. Diluvium. 
3. Fresh-water Marl. 
4. London Clay and Calcaire Grossier. 
5. Plastic Clay, with its sands and gravel. 
6. Transition Limestone. 
7. Grauwacke. 
8. Primitive Rocks, Marble, Mica Slate. 
There are also indications (but less certain) of new 
red-sandstone and magnesian limestone. 
The Alluvium and Diluvium (Nos. 1. and 2.) have been 
already spoken of. 
3. The Fresh-water formation (No. 3.) occurs a little 
north of the Petroleum Wells, and of the district in which 
the bones were found near Wetmasut, and is at an eleva¬ 
tion of 150 feet above the Irawadi. The specimens of it 
consist exclusively of marly blue clay, containing fresh¬ 
water shells of the genus Cyrena : the shells are very thick 
and heavy, nearly three inches in diameter, and judging 
from the great quantity imported, must be extremely abun¬ 
dant ; and, though accompanied by no other organic re¬ 
mains of any kind, are sufficient to establish an analogy, 
in the strata containing them, to the fresh-water form¬ 
ations that occur associated with the tertiary strata of Eu¬ 
rope. There is, however, no evidence to show any con¬ 
nexion between these fresh-water deposits and the fossil 
bones or wood : from the portions of iron and gravel ad¬ 
hering to many of the remains of tortoise, crocodile, and 
hippopotamus, it should seem that they had no connexion 
with the fresh-water deposit: still the abundance and size 
of such animals, show that there must have been large 
rivers or lakes at the time and place in which they lived; 
though it would not justify our assigning them, without 
