BY W. N. BENSON. 



Gully. Again, the drifts covering the 

 margin of the granite in the Parish of 

 Woolomol have this conjoint origin. The 

 very large amount of drift at the present 

 head of Seven- Mile Creek has been pre- 

 served in its present position by the 

 capture of the headwaters of this stream, 

 which now flows northward as Daruka 

 Creek, to join Moore Creek. It is pro- 

 bable that the broad areas of drift that 

 form the central part of the Parish of 

 Woolomol similarly owe their preserva- 

 tion to the capture of their parent- 

 stream, of which the headwaters are 

 known as Levy's Springs, by Spring 

 Creek, which runs through the Tam- 

 worth Common. 



Where the drift is entirely derived 

 from mudstones, it decomposes into a 

 clay suitable for the manufacture of 

 bricks. The clay-deposits of this char- 

 acter at West Tam worth are more than 

 twelve feet thick. 



A considerable thickness of stream- 

 drift lies below the alluvium of the flood- 

 plain of the Peel River. From records 

 in the Department of Public Works, 

 kindly placed at the writer's disposal by 

 the Chief Engineer for Pvailway Con- 

 struction, it is to be seen that the bed- 

 rock of the Peel River valley at the rail- 

 wav-viaduct lies at a depth of forty to 

 fifty feet below the present land-surface. 

 The basal portion of the drift consists 

 of from two to four feet thick of clay, 

 which is covered by clay, gravels, and 

 drift up to a thickness of twenty-four 





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