92 



S. V. WOOD, JUN., AND F. W. HAEMEE ON THE 



denudation, exhibits its interglacial origin very distinctly ; and the 

 following line of section (No. XIII.) is taken across it near North 

 Walsham, where actual open sections afford the means of verification. 



Fig, 13. — Section XIII., across the Ant Valley. (Length 2-| miles. 

 Yertical scale 17| times the horizontal.) 



s.w. 



One mile 

 south 

 ofBT. 



Walsham. 



Sand- 

 pits. 



Brick- Kiver 

 pit. Ant. 



Eoad- 

 cutting 

 and pit. 



Brick-pit on 

 Edingthorpe 

 Heath. 



N.E. 



5'. The Cromer Till (probably). 

 The other references as in fig. 11. 



Into this valley, as into that of the Glaven, the Middle Glacial 

 plunges boldly down ; and the natural section afforded by the coast 

 of the country traversed by them, being not far distant, serves to 

 check the accuracy of the above representation. 



The Tese is an affluent of the Yare ; and its valley in a course of 

 about twelve miles (without reckoning the windings) is cut down in 

 its upper extremity to the Middle Glacial only, and in its lower to 

 the Lower Glacial pebbly sands, the Crag, and the Chalk. So great 

 has been the interglacial denudation of this valley, that we have 

 been able to find excavations in remnants of the Contorted Drift at 

 three x^laces only along its course. One of these is half a mile N.E. 

 of Shottesham-St.-Mary church, the second 6 furlongs N. by E. of 

 Stratford-St. -Michael church, and the third one mile N. by E. of 

 Newton-Flotman church. Assuming, as we think we are entitled 

 to do from the presence of these remnants and from the occurrence 

 of the Contorted Drift north, south, east, and west of this valley, that 

 this drift once extended in full force over it, the interglacial 

 denudation of the Tese valley was almost complete. The line of 

 section XIY. is drawn across the principal valley, and a small one 

 tributary to it, at the point where one of these remnants of the Con- 

 torted Drift occurs. This deposit here yielded us Tellina balthica, 

 Mactra ovalis, and Cardium edule. 



Just north of the above line of section, a bed of clay with chalk 

 debris occurs in the valley-bottom, resting on glaciated chalk. 

 There are similar occurrences at several places along this valley ; 

 and some, if not all, of these, we think, must belong to the same bed 

 as that marked a underlying the middle Glacial in the Yare valley 

 in section Y. 



In the case of this valley, as in that of the Yare, it is very pro- 

 bable that the interglacial excavation was deeper than the present 

 one, and may be continued down into the Chalk below the level of 

 the river, where we have represented valley -gravel (10) as present. 



