1873.] SHARP OOLITES OF NORTHAMPTONSHIRE. 273 



is the "Best Black" ironstone (cellular), then the "Second," to- 

 gether from 4 to 5 feet in thickness : a calcareous band of 6 inches 

 comes in here ; and below it, succeed — the " Bottom " ironstone (so 

 called), also cellular, 2 feet ; a green ferruginous bed, 1| foot ; and 

 a thin ferruginous band, " full of water," and containing small 

 pebble-like nodules (as in the same bed in different ironstone quar- 

 ries about Northampton), 9 inches ; and under all the Upper Lias. 

 As far as I have been able to ascertain, no fossils have been found in 

 these beds. 



Section at Burghley-Parh Ironstone- Quarry. 



ft. in. ft. in 



1. Soil and Bubble, with patches of Collyweston Slate at bottom 2 6 



2. Lower Estuarine Series — 



a. Sand — pale yellow, becoming redder towards the bottom 5 



b. Blue clay, with vertical plant-markings 1 6 



3. Ferruginous Beds — 6 6 



a. " Best Black " Ironstone, cellular 2 



b. "Second" — less cellular, and more sandy 2 



c. Calcareous band 6 



d. " Bottom " ironstone, cellular 2 



e. Green ferruginous stone, about 1 6 



/. Thin red ferruginous band, with pebble-like nodules (as 



at Duston and Kingsthorpe) 9 



8 9 



(The last two beds were " full of water.") 



4. Upper Lias Clay. 



Within a few hundred yards to the west, are Lumby's Terra- 

 cotta Works. A band in the Lower Estuarine Clays supplies an 

 excellent material (mixed with some other ingredients) for this 

 manufacture, and a very durable cream-coloured terra-cotta is pro- 

 duced. Similar clay is found at other places in the same bed, and 

 is largely used in the well-known Terra-cotta Works of Mr. Blash- 

 field of Stamford. 



At a quarter of a mile further south, on the roadside opposite 

 Whincup's Farm, is the old stone quarry of the abolished Trustees of 

 the Great North Road. The Lincolnshire Limestone is here seen in 

 section to the depth of 18 feet : it is divided into eight distinct beds, 

 varying in mineral condition ; some are marly and others oolitic, 

 those near the bottom having much of the character of Barnack 

 Bag, being coarsely oolitic, and containing numerous small shells. 



Section in the Lincolnshire Limestone in the Old-Road Pit, near 

 Whincup's Farm. » . 



1. Rubble and broken limestone 1 6 



2. Compact cream-coloured marly limestone, in thin layers much 



broken 3 



3. Soft white marly limestone, surfaces and angles rounded by 



weathering {Lima bellula, Mor. & Lye.) 2 6 



4. Hard cream-coloured limestone, rather oolitic 3 



5. Oolitic limestone, like the " cale " of Collyweston 2 



6. Soft crumbling " caley " oolite 2 6 



7. "Rag" bed — coarse oolite, containing numerous shells, Lucin a 



Wrightii, Oppel, Opis, &c 1 6 



8. Hard oolitic stone — not bottomed 2 6 



VOL. XXIX. PART I. T 



