Outline is Representative of Size and Shape:
Basal Double Tang

Name Details:
Identified By:  Richard MacNeish
Named For:  Point attributes
Date Identified:  1958
Type Site:   Pueblo Site, Sierra De Tamaulipas, Mexico
Point Validity: Valid type

MacNeish was a  renowned anthropologist who identified this point during his work at Sierra De Tamaulipas Mexico.  This type was named in a professional publication, but has limited professional references.  Perino, 1991 discusses this type, but most other references are collector sources  This type is considered a valid type due to some professional references, but may be better considered a collectors type.
Basal Double Tang
Cluster:
Description of Physical Characteristics and Flaking Pattern:
This is a broad medium triangular stemmed point with an elliptical cross section.  The blade is primarily excurvate when new and may vary to having an incurvate blade with heavy re-sharpening.  The shoulders are barbed with a straight stem.  The base has a deep center basal notch that extends the length of the stem, giving the appearance of two smaller stems.  This point has a random flaking pattern. 
Size Measurements:

Total Length - 25 to 55 mm,  Stem Length - 5 to 8 mm,  Blade Width - 28 to 50 mm,  Stem Width at Shoulders - 23 to 25 mm (***based on small sample size***)
Commonly Utilized Material:
Additional Comments:
Distribution:
Distribution Comments:

This point is primarily found in Zacatecas, Mexico and into western Texas and southern New Mexico with decreased frequency.
Age / Periods:
Date: 3,500 - 2,000 B.P.
Cultural Period:Transitional Archaic
Glacial Period: Neoglacial to Roman Warm
Culture:
Age Details:
Similar Points:
Bell
Other points in this cluster / Related / Associated Points:
Dolores
Pictures: 

Pictures Provided By:
Basal Double Tang Projectile Point, Basal Double Tang Arrowhead
Riley Beckham

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References: (See Reference Page, Entry Number):

23