Vol. 57.] 



OF THE NORTH COTTESWOLDS. 



149 



The results seem to point to this : — That a force acting north- 

 westward and south-eastward produced the main axis ; that forces 

 acting south-westward and north-eastward produced the lateral 

 axes, even compressing the main axis so that the Mendips and 

 a spot about the Pewsey Yale were elevated as the highest points, 

 thus becoming foci of the lateral axes. 



VI. Appendix I. 

 (a) The Position of the Upper Trigonia-gY\t. 



To complete the information concerning the rocks upon which the 

 Upper Trigonia-grit rests, in those portions of the Cotteswolds where 

 there are no intervening beds, which have consequently not been 

 dealt with in the series of papers mentioned on p. 138, the following 

 notes may be made ; — 



Midford, near Bath : the Upper Trigonia-^Tit rests upon sands ; Struckmanni 



beinera. 

 North Stoke, near Bath : upon sands ; Dumortierice hemera. 

 fcodbury : upon Freestone, some 10 feet; MurchisoncB hemera. 

 Wotton-under-Edge : upon Freestone, some 25 feet ; MurchisoncB hemera. 

 Uley Bury : upon strata of the Pea-grit Series and Freestone, some 60 feet ; 



MurchisoncB hemera. 



This is travelling from south 



to north for a distance of about 

 30 miles. The successively later date and the increase in thickness 

 of the strata beneath the tipper Trigonia-grit should be noticed. 



Fig. 5. — Diagrammatic section from Stroud to the Mendips, showing 

 the relation of the Upper Tngoma,-grit to the underlying beds. 



The Mendips formed the anticlinal axis in this case ; a rise in the 

 Mendips (pre-Upper Trigonia-giit) produced the results illustrated 

 above (fig. 5). 



