MAKKs OF I'KUCL'.SSION UN 81L1( KuL.S UOCKS, 



1. EXTERNAL FACE (Indical Face). (E.F.) 



It is obvious thai the original crust or surface of the 

 parent block must represent the eyternal face of tne first 

 llake that was struck off. This flake may remain as it is, 

 and It may be taken in use just as -i fell off. or else it may 

 be considerably altered by chipping, to such an extent 

 that sometimes hardly any trace of the original surface is 

 left. 



The external face. or. as I prefer to call it the Indical 

 lace, is always mere or less convex, only in rare instances 

 it is flat. (See later. Internal Flakes). The tenn "ex- 

 ternal flake" may appropriately be used for all flakes, whose 

 indical or external face is formed by the original surface of 

 the pai'cnt block. 



2. INTERNAL FACE (Pollical Face). (I.F.) 



It is obvious that the internal face, or. as I prefer to 

 call it, Pollical face, is opposite the external one, and must 

 represent the plane of fracture along which the flake was 

 detached from the parent block. it is, therefore, unques- 

 tionable that if there are any marks of any kind on it, the 

 negatives of such marks must appear on that part of the 

 nucleus where the Hake became detached. 



The internal or Pollical face is usually flat, sometimes 

 slightly convex towards the proximal end, but it never 

 attains the convexity of the external face. The accessory 

 marks of percussion must always appear en the internal 

 fa.ce (1). 



3. THE PROXIMAL END OR EDGE (p.e.) 



That portion of the flake which was stiaick by the 

 hammer stone may be called the proximal end or edge. 

 It is obvious that the proximal end must bear the strongest 

 effects of percussion, having sustained the first impact. 



4. THE DISTAL END OR EDGE (d.e.) 



That portion of the flake opposite to the point of im- 

 pact or proximal edge may be called distal end or edge. 



(1) It is Imnlly necess.'iry for me to expliiin that it is tlie cnse of ;in externc-il 

 flake just as it fell off, and not of one whose exlernal or iniliial fiice \v;is suh- 

 sequently wrought. 



