304 sir H. C. EN"Gt.E field's Additional Ohfervations on 



not examined, and little doubt can be entertained of its fimilarity 

 to the reft of the range, to which it evidently belongs. ' ■ 



In Brading pit fome flints appear in detached nodules, and thefe 

 are ibund and unbroken. 



The inclined ftrata of flint are vifible, but not to advantage, ow- 

 ing to the manner of working the pit. In thefe ftrata the flints are 

 univerfally fhattered, fome into abfolute powder, others into groffer 

 powder and fragments mixed. Bat bcfides thefe ftrata, the chalk in 

 this pit is divided by vaft perpendicular fiftures, as fmooth as plaifter 

 walls, and in fome of thefe fiftures flint has formed, which appears 

 broken like that in the ftrata. 



The road above Knighton only juft cuts into the chalk ftratum, 

 but all the flints vifible in the banks are extremely fhattered. 



The pit at the weft end of Aftiey-down, near two large barrows, 

 is the moft extenfive and fatisfa6lory of any I have feen. The per- 

 pendicular face of the chalk, where worked, is not lefs than fifty or 

 fixty feet, and its direcfion is at right angles to that of the ftrata, 

 and parallel to their line of dip : — of courfe, they aie feen to very 

 great advantage. The ftrata feem to dip northward more rapidly 

 than in any other place where I could obferve them. The angle of 

 inclination is from 75 to 80 degrees. There are not layers of flint 

 between every layei of the chalk. Some of the chalk is peculiarly 

 folid, and rifes in very large maffes, affecting a cubic form. Their 

 folid vein is from tv^enty-five to thirty feet thick, and is in ftrata 

 from three to four feet. In ail this folid part there are very few 

 flints. 



Both above and below this harder bed (fpeaking of the original 

 pofition of the ftrata) the chalk is fofter, and has more flints in it. 

 The ftratifteJ flints in this pit are full as much fhattered as any I 



. 6 had 



