274 NATURAL SCIENCE. Oct.. 



8. Thus both the travel-worn gravel and implements must 

 necessarily have had their source in the flints of Chalk situated at 

 some higher level. 



II. — Why not belonging to a local ochreous drift, deposited 

 originally on the plateau ? 



The reply is: — i. Because the plateau is out of reach of any 

 present (or late) water-level, 



2. Because there is too little of the ochreous gravel there to 

 constitute such a local drift. 



Notes. 



I. — The old brown " plateau implements " are not found beyond 

 the plateau, except in a iew instances when they have been derived 

 from the wear of the plateau, and probably this may be said also of 

 other plateaux. 



2.— As to these being natural forms, where can any such forms 

 be shown to occur in a river-gravel ? 



3- — The extremely worn condition of the ochreous flints and 

 implements indicates long-continued movement and great water- wear, 

 if not violent transport ; and no well-marked, definite deposit of such 

 a gravel occurs. The tail of the old deposit on the Dome, however, 

 may have extended from the original slopes down to the Chaik level 

 (now the plateau), by more or less violent slides and debacles, before 

 the bounding or dividing valleys were excavated in the Glacial Period. 



The following is a list (from letters) of the Rude Implements 

 found in situ by Mr. Harrison. For the localities, see the Map, Quart. 

 jfourn. Geol. Soc, vol. xlv., pi. g, and Jotirn. Anthropol. Iiistit., vol.xxi., 

 pi. i8. 



I. — One flake, rude. — From an old sand-pit (now a pond) at Ash. 



2. — Three rude implements. — From a trench nearly three feet 

 deep, in sand, with green-coated flints (probably a remnant of 

 Thanet or Woolwich-and-Reading Sands), at Ash. 



3. — Two rude. — From a trench in similar sand, 2i feet deep (for 

 laying in mangold wurzel), at Ash. 



4. — Two rude. — From deep-red clay at the Vigo, two finds with 

 an interval of two years. 



5. — One rude. — From a hole (for finger-post) in red clay at the 

 Vigo Inn. 



6. — One rude — From red clay thrown out in digging a grave at 

 Cudham churchyard. 



7. — Several rude. — From trench (for water-pipes), crossing a patch 

 of ochreous gravel on red clay (?), at Dunstall Hill, Shoreham, Kent ; 

 three tips of neoliths (?) and many rude implements, all water-worn. 



8. — One rude (?). — From a post-hole, 2^ feet deep, at Kingsdown. 



9. — One rude. — Fine large implement, at 2^ feet. Ash. 

 10. — Several rude. — From a deepened dew-pond, near the 775 feet 

 summit level ; about thirty rudely- worked flints, and some Oldbury 

 Stone (Lower Greensand). 



