﻿Capt. MacdaMn — Northampton Ironstone Beds. 



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that the beds are much richer at this distance from Lincoln, but 

 that they become very siliceous and pass into a ferruginous sand 

 above Normanton about eighteen miles to the south. 



Fig. 1. — Section of the Northampton Ironstone beds eight miles South of Lincoln. 



Oolitic Limestone 

 35 feet thick. 



I. Peroxide bed 



II. Clay ironstone 



III. Hard carbonate of iron 



IV. Clay parting 



V. Hard blue carbonate of iron 



VI. Peroxidised band 





VII. Nodules and clay partings 



VIII. Blue ferruginous sand bed 



IX. Ironstone nodules 



X. Clay with nodules (micaceous) 



XI Coprolites and pyrites 



XII. Blue Lias clay 



Inches. 

 8 

 4 

 9 

 4 



16 

 10 



11 



13 



36 



10 ft. 



In the physical geography of the country, the Northampton Sands 

 occupy the upper part of the escarpment (Fig. 2 B, D), known as 

 the Cliff, running roughly parallel to the Great Northern Eailway 

 (Fig. 4) from Glrantham to Lincoln. At about a quarter of a mile 



Fig. 2. — Section of Cliff showing in the shaded portion of C, the oxidised 

 'outcrop of the iron bed. 



A, Lincolnshire Limestone. B, Lower Estuarine bed. C, Northampton Ironstone bed, 

 oxidised fromjthe outcrop towards F, this bed being ten feet thick. D, the Coprolite 

 bed four inches. E, Lias clay. 



