•part 3] A NATURAL 'EOLITH ' FACTOBr. 241 



the Chalk surface which has taken place in comparatively recent 

 geological times. 



To dig the Hints out of this deposit, to note the pressure-points 

 •of one stone against another, and the resultant effects, is a liberal 

 •education in the study of natural chipping. In many instances 

 "the flakes which fit the facets upon the pseudo-implements still 

 remain in their original positions, and may he recovered in place. 



(A) Pressure-Cones. 



These are produced when a force of sufficient magnitude acts 

 •centrally (and not on the edge) of a flint. This is an important 

 point in the general understanding of natural flint-chipping, but it 

 •can never be mistaken for human workmanship. Moreover, it has, 

 I think, been sufficiently dealt with in previous publications. 



(B) Kentish, or Plateau, Forms of ' Eolith/ 



(1) PI. XY. — Photograph of a flint with a smali 'Eolithic : notch 

 squeezed out of its edge ; it is shown in place in the residual banded 

 layer of the Bullhead Bed, with the slickensided under surface 

 next the Chalk. The length of the notch = l7"5 mm. 



(2) P. 240. — Flint with a large open notch squeezed out of either 

 .side. Dimensions, 67 x 53 x 29 mm. The average chipping-angle, 

 neglecting the extremes, is about 80°. (This will be given in the 

 same manner in each case, unless otherwise stated.) Each of the 

 two larger chips which were recovered in place from the right- 

 hand side had an ' Eolithic ' notch squeezed out of its edge by 

 ■cross-pressure. 



(3) Kentish Eolith, collected by Mr. B. Harrison, of the same 

 essential form as (2). This illustrates the fact that many Kentish 

 Eoliths may be paired with Bullhead chippings. 66 x 44 x 25 mm., 

 80° ; the extremes being from 65° to 105°. 



(4) Rectangular ' scraper,' with separate view of the chipped 

 edge. A particularly fine example of regular flaking, superior to 

 the average Eolith. 58 x 59 x 23 mm. 



(5) ' Scraper ' with engrailed edge. A characteristic Kentish 

 form. 90 x 45 x 30 mm., 73°. 



(6) Oblique view of a single notch, found in the top of the 

 Chalk, a piece of which is still adherent to the back edge. 

 78 X 55 X 27 mm. The chipping-angle swings from about 70°, 

 through 100°, up to 130° on the crushed and blunted edge, the 

 same features being frequently seen upon the Kentish flints. 



(7) Small single notch ; this represents the ideal type of the 

 Kentish group. 42 X 33 x 16 mm.. S0°. 



