256 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 5, 



and discrepant the rate of deposition at the two points during the 

 passage of time represented by the whole thickness of beds, the ag- 

 gregate amount of deposit at both points only differed in the pro- 

 portions of 49 to 50. 



The measurements of the beds of the Lincolnshire Limestone 

 exposed at Simpson's Quarry, on the " Lings," in Tinkler's Quarry, 

 and in the well, give 65 feet as the total thickness of the formation 

 here. 



A well at Torkington's brick-pit (half a mile to the east) pierces 

 through a thickness of 74 feet of the same beds ; this about tallies 

 with the thickness pierced by a well sunk by Mr. Browning the 

 architect, at a somewhat lower level in North-street, allowing for a 

 diminution of thickness at the top. 



Some excavations were recently made, at a lower level than 

 Tinkler's Quarry, near to the Scotgate entrance to Stamford ; which 

 exhibited the Slate beds reposing on the Lower Estuarine Sands. 



For the foundations and cellars of the houses of the Rock Terrace, 

 hard by, excavations were made in the Ferruginous beds of the 

 Northampton Sand ; so that the surface of the Upper Lias Clay 

 cannot be many feet below the level of the street at this point. 



Thus it has been shown that the escarpment of the high ground 

 north of Stamford presents a complete sequence of beds, from the 

 Cornbrash at the summit to the Upper Lias at the base ; the 

 Lincolnshire Limestone being by far the most important formation 

 of the whole group *. 



The District East and Noeth-East oe Stamfoed. 



To the east and north-east of Stamford, the various beds are con- 

 siderably depressed. On the road to Uffington, immediately north 

 of the bridge which passes over the Stamford and Essendine Railway, 

 and abutting upon the deep cutting here, is Mr. Eldret's quarry ; 

 in which is a fine section, exposing a thickness exceeding 30 feet of 

 beds of the Lincolnshire Limestone. 



The floor of this quarry is only a few feet higher than the level 

 of the "Welland river at this point, although the base of the lime- 

 stone has not been reached. 



This is a very good typical section of the middle beds of the for- 

 mation ; which here has thickened considerably. It consists of a 

 series of fifteen distinct beds of limestone, of varying character : 

 some are oolitic (one being a true " freestone"), and these are in an 

 unusual position, at the bottom of the section, while others, and 

 by far the greater part, are marly, and devoid of oolitic grains ; 

 some are soft, like the Squires's-pit " Stamford Stone," while others 

 are hard, and sometimes crystalline and blue-hearted ; some are 

 very fossiliferous, while others are slightly so, and some apparently 

 bare of fossils. In my detailed notes of this section, I have recorded 

 the peculiar names by which the several beds are identified by the 

 quarrymen. 



* See Diagrammatic Section, Plate X. fig. 2. 



