612 



MR. C. B. WEDD ON THE 



[JS'ov. 1898, 



gcal.e: 

 1 inch =• I ^nile 



Hi'gh Hen Fa> 



the fen. He points out that the Elsworth E-ock and overlying beds 

 form a denuded anticline south of the well. He has also traced the 

 Elsworth Eock for nearly a mUe eastward towards Wicken, where 

 it is followed by higher Corallian for about 20 yards before reaching 

 the fen. Farther north, near the windmill, he found the Upware 

 Corallian type again. It had been recorded, however, by the late 

 Prof. W. Keeping and Mr. Tawney, beneath the Greensand at the 

 brickyard farther east.^ 



A rough sketch-map is here given, showing the position of the 

 Elsworth Eock at the surface, and Mr. Keeping's suggested exten- 

 sion of the Corallian. It is taken from the 1-inch Geological 



Survey Map, the portions 



Geological Map of the neighbourhood marked off by boundary- 



0/ Upware. lines being those mapped 



by the Geological Sur- 

 veyors, while the farther 

 extension to the south 

 is indicated outside these 

 boundary-lines. 



It was stated by Mr. 

 H. B. Woodward (Geol. 

 Surv. Mem. 1891) that 

 the Corallian beds here 

 seem to have no constant 

 dip : it was shown by Mr. 

 Eoberts that a fold or 

 a fault (of which latter 

 there is no evidence) was 

 necessary if the Northern 

 Qaarry oolite was to be 

 placed below the Eag; I 

 have mentioned (p. 602) 

 that the dip changes 

 visibly in amount within 

 the Southern Quarry ; 

 and Mr. Keeping has 

 pointed out that there is 

 an anticline before the 

 final disappearance of 

 the Corallian beneath 

 the fen to the south. 

 There is then abundant 

 evidence that the beds 

 undulate, as Mr. Wood- 

 ward suggested. An- 

 other apparent anticline will be indicated subsequently between 

 the Southern Quarry and the Inn. 



The stratigraphical relationship of the Elsworth Eock at Upware 



^ See W. Keeping, ' Fossils ... of Upware & Brickhiil,' Sedgwick Prize Essay 

 for 1879 (1883). 



MiU 



wm 



1^ 



Tf^-i 



•Ti:":'^^: 



/Veocomian 



Upware Limestone 

 (Rag & Oolite) 



Elsworth 

 Rock 



