Brewerton Eared

Point Type:  Brewerton Eared             
Associated Date: 4800 - 4300 B.P.
Morphology:  Side Notched

Length Point:        
Ave: [ 38 +/-  9 mm]  
Range: [ 19 to 64 mm] 
Example: [ 41 mm]

Width Point:         
Ave: [ 21 +/-  4 mm]  
Range: [ 14 to 29 mm] 
Example: [ 22 mm]

Point Ratio (Width / Length):  
Ave: [.57  +/- .17 ]

Length of Base:      
 (Shoulder to Base)
Ave: [ 10 +/-  2 mm]  
Range: [ 6  to 15 mm] 
Example: [ 8  mm]

Width of Base:       
 (Maximum)
Ave: [ 21 +/-  4 mm]  
Range: [ 13 to 29 mm] 
Example: [ 22 mm]

Depth of Notch:      
Ave: [1.4 +/-  .3 mm] 

Base Length/Point Ratio:  
 (Length of Base  / Length Point)
Ave: [.28 +/- .05 ]

Base Width/Point Ratio:          
 (Width of Base  / Width Point)
Ave: [1.0 +/-  0  ]
 
Base Ratio:        Ave: [.51 +/- .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: [.07 +/- .01 ]
 (Depth Notch 
   / Width Point)

Blade Ratio:       Ave: [1.4 +/- .5  ]         		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: [1.2 +/- .8  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: [131 +/-  13 o]
 (Angle of Shoulder from   
 Notch Center to Shoulder to Tip)


1993 - Tara Prindle