110 Mr. P. J. Martin on the Anticlinal Line of 



The "subcretaceous zone" will now engage the observer's atten- 

 tion, and he will meet with greater complexity of composition : 

 on the upper beds of the lower greensand, angular flint, chert, 

 fragmentary sandstone, and the above-mentioned carr-stone in 

 angular masses, thrown together in various proportions and with 

 more or less rubble, and often lodged in hollows scooped out of 

 the soft sand-rock. There is yet no admixtux'e of materials 

 foreign to the country, except now and then a few " eocene peb- 

 bles," and, more rarely still, some pebbles of hard chalk. 



I have alluded to some exceptional cases to be found in a 

 renew of the drift of the Weald. The two most remarkable of 

 these with which I am acquainted are, the gravel beds at Hever, 

 on the banks of the Medway, as described by Sir Roderick Mur- 

 chison (Journ. of Geol. Soc. he. cit.), and a no less important 

 bed on the banks of the Arun at Slinfold, between Horsham and 

 Rudgwick, in the central valley of the axis of the Weald. I had 

 the pleasure of showing the last-mentioned bed to Sii" Charles 

 Lyell last summer. It is composed of the rubble or detritus of 

 the surrounding Wealden, much angular chert, angular flint, and 

 some eocene shingle with particles of hsematite from the ferru- 

 ginous sands of the lower greensand. I believe it more likely, 

 that in both these cases the materials of these beds of drift were 

 not brought from the several districts in which they are now 

 found in situ, but were derived from the kindred masses left 

 behind at the periods of great convulsion, and in the yawnings 

 of the great fissures at the time of upheaval. The nearest points 

 from whence the flints and eocene pebbles of the Slinfold drift 

 could be derived by transport, are, on the north, twelve, and on 

 the south, seventeen miles ; and neither of these in the most 

 probable line of drift, viz. from west to east, along the longitu- 

 dinal valleys of the Weald. 



I have already said, in another place, that mammal bones have 

 been found in the drift of the Wealden districts ; and as some 

 inferences have been drawn from the position and levels at which 

 these discoveries have been made, it may be well to recur to that 

 subject. I have a fragment of an elephant's tooth found by Mr. 

 W. Constable at Charlwood, near one of the sources of the Mole. 

 Elephants' bones have been found at Coldwaltham, sixty feet 

 above the sea-level. Other mammal bones at West Burton in 

 chalk-rubble something higher, and at Burpham still higher, as 

 mentioned by Mantell and Sir R. Mm-chison (Journ. of Geol. 



does not abound, enables me to speak with great confidence of this minute 

 but significant feature. In many places where the plough has been at work 

 for centuries, but more still in fresh broken hedgerows and coppice ground, 

 these fragments are turned up sometimes in an angular and uneven state, 

 sometimes a little water-worn. 



