58 FIELD GEOLOGY. 



be S. 7 E., and we draw on the map, and near the posi- 

 tion of the pit, an arrow pointing S. 7 E., with the 

 number of degrees of dip also shewn (p. 33). 



We observe that the chalk is jointed in every direc- 

 tion, and that the surfaces of some of the joints, diagonal 

 and vertical, are of a dirty yellow colour, and covered 

 with small strise, as though one face of the jointed rock 

 had slipped over the opposing face, both getting smoothed 

 and striated in the process. This is what has happened, 

 the resulting appearance being known as " slickenside " 

 the chalk has been at some period subjected to slight 

 disturbance this is further evidenced by the small 

 fractures and faults. In the S.E. corner one of the 

 latter is plainly shewn on a small scale, the downthrow 

 not exceeding 1 foot the continuity of the lines of flint 

 being broken, all of them suddenly rising to that extent. 



All the flints are black but have a thin white coating 

 the majority occur in nodules of varying size, from 

 that of a hen's egg to a quartern loaf, but one seam is 

 tabular, that is, it consists of an almost continuous stratum 

 of flint about 1J inches in thickness. Similar flint in 

 tabular form occasionally is seen running away from 

 this seam down the diagonal or vertical joints, and 

 sometimes even cutting directly across a layer of flint 

 nodules. 



Date 187 . 



Chalk pit (and lime-kiln) mile of 



(at junction of the road with old Eoman way). 

 40 feet chalk with flints in layers about 6 feet apart 



dipping 3 to S. 7 E. slightly faulted and broken up 



into blocks of small size. One layer of flint, near the 



bottom, tabular and running off into the joints, which 



