xv. GREAT HAZELEY AND BRILL. 417 



At Great Hazeley the Portland stone has been quarried from 

 ancient time., and it there furnishes a limited supply of better 

 quality than usual for building 1 , being of good colour and firm 

 and equal texture, except for the shells, which, however, mostly 

 lie in bands. A thick grey or greenish sand is at the bottom ; over 

 this the stony series, the lower part workable freestone, the top 

 hard splintery limestone, 2 feet thick, much jointed, fit for roads 

 and rough walling, called c Curl,' which suggests the idea of Purbeck 

 beds. This is immediately followed by the iron-sand and clay 

 series. 



SECTION AT GREAT HAZELEY. 



ft. in. 

 12. Soil, uniformly spread, with drift on the surface of chalk flints, and red 



grit pebbles. 



ii. Brown sand and laminated ferruginous sandstone, or ironstone, with some 

 argillaceous parts. In this bed Paludina elongata and others, lying in 

 separate short tracts or nests, as at Shotover Hill. Thickness, 3 to 

 5 feet seen. 



10. The lower surface is undulated in a surprising manner, and rests on a 

 yellowish or white laminated clay, with thin brown irony bands. 

 Thickness 3 to 5 feet. The bottom rests level on the next bed. 



9. Brown ferruginous level sands, false bedded, the laminae dipping N.W. . I 6 

 8. Dark irony band ........ ...03 



7. White laminated clay . . . . . . . . . .16 



6. Dark irony band, false bedded as above I o 



5. Brown ferruginous band, false bedded as above 26 



4. White argillaceous laminated bands 20 



3. Blue clay bands, laminated 9 



2. White laminated clay bands 06 



i. Brown laminated clay bands 06 



Curl stone of the Purbeck or Portland series below. 



The sections at Brill have been re-examined at different times, 

 and the extension of the characters of the iron-sand of Shotover 

 to that interesting hill made more evident by the discovery of 

 fresh- water shells there in the higher beds. In the twin hills of 

 Muswell and Brill the observer has the advantage of seeing a large 

 number of quarries and other openings for stone, sand, and clay, 

 and the natural accompaniments of such strata, many perennial 

 springs of sweet water, very little charged with iron or lime, by 

 their free percolation to the depth of a few yards. The well-known 

 and strongly-impregnated chalybeate of Brill rises not out of these 



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