248 PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [Feb. 5, 



of the new Chapel of St. John's College, Cambridge ; from the chip- 

 pings at which place, through the kindness of Mr. Keeping of the 

 Woodwardian Museum, I obtained a fine specimen of the Pterocera 



Benileyi. 



Easton. 



The Ferruginous beds of the Northampton Sand, underlying the 

 Lower Estuarine, thicken in Easton parish, and may be seen in 

 some trial-holes, north of the village, on the hillside looking towards 

 Tin well. They are here some 15 feet in thickness, and consist of 

 cellular ironstone of a rich character. 



Wothorpe to St. Marten's. 



Just east of Easton, reached by a slight descent, is Wothorpe 

 Grove. Here, to the right, on the excavated side of the road, and 

 high up on the southern escarpment of the Welland valley, may also 

 be seen the Ferruginous beds of the Northampton Sand, overlying 

 the; Upper Lias Clay. The Lias on this side attains to a much 

 higher elevation than on the Rutland side of the valley, and extends, 

 in a kind of ridge, still capped with the ironstone, for a mile and a 

 half to the north-east, into Burghley Park ; at which point, it con- 

 siderably overtops the town of Stamford. A copious spring, the 

 drainage of the Lincolnshire Limestone and Northampton Sand to 

 the south, occurs near to the Wothorpe ruins, at the junction of the 

 latter bed with the Lias Clay ; and the water is caught in reservoirs, 

 which are of sufficient elevation to supply by gravitation every part 

 of the town of Stamford. 



Faults. 



This discrepancy of level is the result of faults ; one of which I 

 have mentioned as traversing the section of the Geeston cutting near 

 Ketton. Another strikes athwart the Welland valley and the Stam- 

 ford parish of St. Martin, and extends some miles to the east. To 

 the latter fault, and to its very remarkable and apparently anomalous 

 conse«fHMiees, I shall again allude*. 



I would explain here, that, in the route I have taken for the pur- 

 pose of description, many discrepancies of level, the effects of dip, 

 of the bending of strata, and of faults, might have been noticed ; but 

 as these are not necessarily pertinent to my object, and have been 

 mapped, and will be described, by Mr. Judd, I have deemed it not 

 desirable to add to the length of my Memoir by particularly refer- 

 ring to them. 



Area oe Stamford Field and Neighbourhood. 



Crossing the "Welland valley, to the north of the town of Stam- 

 ford, and into a nook of Lincolnshire, we come to the high ground 

 well known as the Stamford Open Field, now in the process of being 

 enclosed. 



The highest point of Stamford Field is nearly 200 feet above the 

 level of the river "Welland. In this one hill-mass, we have the 



* See Diagram of Section, Plate X. fig. 1. 



