Normanskill

Point Type:  Normanskill                 
Associated Date: 6000 - 4800 B.P.
Morphology:  Side Notched

Length Point:        
Ave: [ 51 +/- 11 mm]  
Range: [ 31 to  70 mm] 
Example: [ 47 mm]

Width Point:         
Ave: [ 20 +/- 3  mm]  
Range: [ 15 to  35 mm] 
Example: [ 20 mm]

Point Ratio (Width / Length):  
Ave: [.39 +/- .05 ]

Length of Base:      
 (Shoulder to Base)
Ave: [ 11 +/- 2  mm]  
Range: [ 7  to 18 mm] 
Example: [ 12 mm]

Width of Base:       
 (Maximum)
Ave: [ 16 +/- 3  mm]  
Range: [ 9  to 34 mm] 
Example: [ 19 mm]

Depth of Notch:      
Ave: [3.7 +/- .06 mm] 

Base Length/Point Ratio:  
 (Length of Base  / Length Point)
Ave: [.23 +/- .03 ]

Base Width/Point Ratio:          
 (Width of Base  / Width Point)
Ave: [.83 +/- .14 ]
 
Base Ratio:        Ave: [.72 +/- .12 ]         		1. Short (<= 0.7)  
 (Base Length                                 		2. Proportionate (> 0.7 & < 1.3)  
   / Base Width)                          		3. Long (>= 1.3)

Base Form:           1. Convex   2. Straight   3. Concave   
 (Subjective) 

Notch Ratio:       Ave: [.19 +/- .02 ]
 (Depth Notch 
   / Width Point)

Blade Ratio:       Ave: [2.0 +/- .3  ]         		1. Lanceolate (>= 2.0 mm)
 ([Length Point                                    		2. Isosceles (< 2.0 & > 1.2 mm)
    - Length Base] / Width)                   		3. Equilateral (<= 1.2 mm)
   
Blade Curvature:   Ave: [1.0 +/- 1.0 mm]  		1. Very Convex (>= 5 mm)
 (Cord height of curve                       		2. Convex (< 5 mm & >= 2 mm)
  from Shoulder to Tip)                   		3. Straight (< 2 mm & >= -2 mm)   
                                                         		4. Concave (< -2 mm)
                                                          		5. Mixed (< -2 mm & > 2 mm)
Shoulder Angle:    Ave: [ 78 +/-  31 o]
 (Angle of Shoulder from   
 Notch Center to Shoulder to Tip)


1993 - Tara Prindle