Vlii EXPLANATION OF THE PLATES. 
PLATE III. 
SECTION OF ROCKS. 
I. Primitive Rocks. 
Fig 
1. Granite. 
2. Gneiss. 
3. Mica-slate. 
4. Clay-slate. 
a. Lime-stone. 
b. Quartz. 
5. Primitive lime-stone. 
II. Secondary Rocks. 
1. Transition Rocks. 
6. Grey-wacka. 
7. Transition lime-stone. 
2. Floetz Rocks. 
8. Old red sand-stone. 
9. Alternating strata of lime-stone and sand-stone. 
III. Alluvial Deposits. 
10. Alluvial strata of clay, gravel, &c. &c. 
The BINDER is desired to insert all the Plates, except 
the Frontispieces, immediately after the Explanations 
in the respective Volumes. 
