Perkiomen

Point Type:  Perkiomen                   
Associated Date: 3900 - 2700 B.P.
Morphology:  Stemmed

Length Point:        
Ave: [ 48 +/- 13 mm]  
Range: [ 33 to 81 mm] 
Example: [ 42 mm]

Width Point:         
Ave: [ 38 +/-  8 mm]  
Range: [ 31 to 57 mm] 
Example: [ 35 mm]

Point Ratio (Width/Length):    
Ave: [.78 +/- .10 ] 

Length of Stem:      
 (Maximum)
Ave: [ 8  +/- 1  mm]  
Range: [  5 to 9  mm] 
Example: [ 14 mm]

Width of Stem:       
 (Maximum)
Ave: [ 17 +/- 3  mm]  
Range: [ 12 to 24 mm] 
Example: [ 22 mm]
 
Stem Length/Point Ratio:  
 (Length of Stem  / Length Point)
Ave: [.16 +/- .03 ]

Stem Width/Point Ratio:          
 (Width of Stem  / Width Point)
Ave: [.47 +/- .12 ]
 
Stem Ratio:        Ave: [.45 +/-  .1 ]  		1. Short (<= 0.7)  
 (Stem Length                                		2. Proportionate (> 0.7 & < 1.3)  
   / Stem Width)                            		3. Long (>= 1.3)

Stem Form (Subjective):  
                1. Contracting   2. Parallel   3. Expanding   4. Asymmetric
                    
Base Form (Subjective):  
                1. Convex              2. Straight            3. Concave  
                     4. Notch              5. Lobe                      6. Point
   
Blade Ratio:       Ave: [1.1 +/- .2  ]          		1. Lanceolate (>= 2.0 mm)
 ([Length Point                                     		2. Isosceles (< 2.0 & > 1.2 mm)
    - Length Stem] / Width)                        	3. Equilateral (<= 1.2 mm)
   
Blade Curvature:   Ave: [3.4 +/- 1.5 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: [ 80 +/-  6  o]
 (Angle of Shoulder from  
 Tip to Shoulder to Shoulder Juncture)

Shoulder Juncture (Subjective):   1. Curve     2. Angle    3. Straight


1993 - Tara Prindle