358 Edward Merrick — The River Tyne Drainage Area. 



TABLE V. 



Slope of the Unconformity. 



Painshaw Hill to Monkwearmouth, 

 133 feet per mile. 



Slope of the South Watershed. 

 Cross Fell to Muggleswick, 77 feet 



per mile. 

 Muggleswick to Cleadon, 36 feet 



per mile. 

 Cleadon coast out to sea on the 



sea-bottom, 20 feet per mile. 



5. Having made allusion to the parallelism of the younger deposits 

 with the junction plane below them, I may next point out the 

 effects of the forces producing the present-day land surface upon the 

 position of the deposits now being formed. 



That the contour-lines of the sea-floor have been produced by 

 these forces is illustrated in the following table, in which it is 

 observed that the contours near the coast are close together, while 

 the deeper ones are wider apart, and it is most prominent that the 

 deeper soundings are between two and three miles nearer inshore 

 off the mouth of the Tyne than elsewhere. This points to the 

 continuation of the Tyne trough seawards, and the spacing of the 

 contour-lines is similar to that along the southern watershed. 



The average slope of the sea-floor off the mouth of the Tyne — 

 23 feet per mile — is greater than the probable slope of the rock 

 surface of the main valley before denudation — 17 to 18 feet per mile. 



TABLE VI. 



The distances in miles are taken from the high-water mark at the 

 base of the cliffs at the rocky points of the mainland. The figures 

 are obtained from the 1 in. Ordnance Maps. All these rocky points 

 do not lie in one line as a base, but the first four are nearly in line, 

 and also the last three in another line. 



6. The contours off the mouth of the Tees are seen to be produced 

 by the forces which made the Cleveland Hills (Fig. 10). 



E. Relationship to other Drainage Areas. 



The superficial deposits in this area prove that the land stood 

 recently at a higher elevation, and that the present tidal part was 

 excavated to a considerable depth which was above the sea-level of 

 that period. This elevation would naturally be accompanied by an 



