LOWER MAGNESIAN LIMESTONE. 



279 



In tracing the layers along the face of these natural walls, they show much tendency 

 to change, and it is only by close observation and great care that an accurate correlation 

 of different sections can be made, and considerable variation is to be expected where 

 much distance intervenes. 



This changeableness will be manifest by comparing the preceding section with the 

 two following, both taken from the same quarter section (S. W. qr. Sec. 25, Mukwa). 



FIG. 32. 



1. Earth. 



2. Magnesian limestone. 30 inches. 



3. White sandstone. 3 inches. 



4. Magnesian limestone. 8 inches. 



5. Oolitic silicious limestone. 7 inches. 



6. Magnesian limestone. 9 inches. 



7. Sandstone. 8 inches. 



8. Thick even-bedded magnesian limestone. 34 inches. 



9. Oolitic silicious limestone. 5 inches. 



3xi777- 10. Sandy magneeian limestone of irregular hcdding and texture. 90 inches. 



^y 11. Irregularly bedded sandstone, marked with iron. 22 Jnchos. 



Total thickness, 10 feet and 6 inches. 



1. Earth. 



3. Yellow sandy and oolitic magnesian limestone. 18 inches. 



\V-.\Vv.V-.\V-.-.V 3. Green sandstone. 4 inches. 

 ^-g^Sr 4. Oolitic magnesian limestone, as above. 33% inches. 



5. White sandstone. 3 inches. 



6. Oolitic magnesian limestone, as above. 9 inches. 



7. Yellow sandstone. 4 inches. 



8. Sandy silicious limestone. 13 inches. 



rr 9. Oolitic layer. 3 inches. 

 i-'v-i 10. Sandy and Oolitic limestone. 13 inches. 



f'.O^7';. -/:-.:. 11. Yellow sandstone, marked with green. 15 inches. 

 Total thickness, 8 feet and 654 inches. 



The increase of silicious matter in the latter is very noticeable. This is perhaps due 

 to the fact that the ledge from which the section is taken here approaches within a half 

 mile of the Archjean outcrop of granite in this town, previously described. As it arose 

 into the Lower Magnesian horizon, it might perhaps rationally be supposed to produce 



