Jack's Reef Pentagonal

Point Type:  Jack's Reef Pentagonal      
Associated Date: 2000 - 1200 B.P.
Morphology:  Stemmed (or Triangular)

Length Point:        
Ave: [ 40 +/- 12 mm]  
Range: [ 19 to 34 mm] 
Example: [ 29 mm]

Width Point:         
Ave: [ 26 +/- 6  mm]  
Range: [ 25 to 45 mm] 
Example: [ 23 mm]

Point Ratio (Width/Length):    
Ave: [.66 +/- .10 ] 

Length of Stem:      
 (Maximum)
Ave: [ 17 +/-  4 mm]  
Range: [ 11 to 24 mm] 
Example: [ 14 mm]

Width of Stem:       
 (Maximum)
Ave: [ 25 +/-  4 mm]  
Range: [ 21 to 32 mm] 
Example: [ 23 mm]

Stem Length/Point Ratio:  
 (Length of Stem  / Length Point)
Ave: [.42 +/- .09 ]

Stem Width/Point Ratio:          
 (Width of Stem  / Width Point)
Ave: [.95 +/- .07 ]
 
Stem Ratio:        Ave: [.68 +/- .11 ]                        	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: [ .9 +/- .3  ]                         	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: [ .9 +/- 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: [145 +/-  13 o]
 (Angle of Shoulder from  
 Tip to Shoulder to Shoulder Juncture)

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


1993 - Tara Prindle