Jack's Reef Pentagonal

Point Type:  Jack's Reef Pentagonal      
Associated Date: 2000 - 1200 B.P.
Morphology:  Triangular / Lanceolate


Length Point:   
Ave: [ 40 +/- 12 mm]  
Range: [ 25 to 45 mm] 
Example: [ 29 mm]

Width Point:    
Ave: [ 26 +/-  6 mm]  
Range: [ 19 to 34 mm] 
Example: [ 23 mm]

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

Base Concavity:    
Ave: [ - .9  +/- 1.1 mm]  

Distal Base Form:		1. Convex ( >= 1 mm)
			2. Straight (< 1 mm & > -1 mm)   
			3. Concave (<= -1 mm)

Lateral Base Form (Subjective): 1. Contracting  2. Parallel     3. Expanding  

Other Basal Traits (Subjective):        1. None              2. Ears              3. Flutes  

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

Blade Ratio:       Ave: [1.5 +/- .2 ]		1. Lanceolate (>= 2.0 mm)
 (Length Point				2. Isosceles (< 2.0 & > 1.2 mm)
    / Width Point)				3. Equilateral (<= 1.2 mm)
   

Blade Curvature:   Ave: [6.8 +/- 2.3 mm]		1. Very Convex (>= 5 mm)
 (Cord height of curve			2. Convex (< 5 mm & >= 2 mm)
  from corner of Base to Tip)			3. Straight (< 2 mm & > -2 mm)   
					4. Concave (<= -2 mm)
					5. Mixed (< 2 mm & > 2 mm)

Base Angle:        Ave: [ 71 +/-  16 o]
 (Angle of Base from 
  Center of Base to Corner of Base to Tip)


1993 - Tara Prindle