94 



PROCEEDINGS OF IHE GEOLOGICAL SOCIETY. 



Fig. 28 is a careful sketch of part of the Cyrena-bed, by Mr. S. 

 Skertchly. The section is as follows, in ascending order : — sands 4 feet, 

 wavy laminated brick-earth beds 6 feet, brick-earth 5 feet, a bed of 

 pebbles from the Woolwich series, brick-earth, and clay 6 feet ; 

 the Cyrena sand-bed, C, passing upwards into laminated brick- 

 earth, gravel, and loam, 25 feet thick. 



Fig. 29 is a section of the most fossUiferous part of the Crayford pit. 



K48. 



Fig. 29. — Section in Crayford Pit. 



•"-: —r-urivTi'.' •,'' ''.'.'r^''^' '^■r.'j',"-'i i.';v 



/.■3'/-/,'2/./,r;>^,',;;; 







along the line K L (see PI. VI.). It represents about 30 feet in height 

 by 150 in length ; so that the horizontal scale is about five times the 

 vertical. It is intended to show the variation in the pebble-beds, C, 

 and the thickening of the whole series in the direction of the escarp- 

 ment. The pebble-beds, C, are in three divisions, and the great Cy- 

 rena-bed, D, rests on one of them ; but shells are found in B, C, D, and 

 E, though not in the covering bed F, which contains flint-pebbles 

 distributed through it in the usual manner. The lowest beds are 

 not seen in fig. 29 ; but at X, near M IST, there are several openings 

 at a depth of 35 feet from the surface, where a bed of coarse gravel 

 is visible, which is near the eroded surface of the chalk. The 

 chalk itself, with a covering of gravel or sand, is seen in the ponds 

 marked P in the Crayford pit, where the Water stands a little below 

 the level of high water. 



