Outline is Representative of Size and Shape:
Name Details:
Identified By:  Douglas Osborne, Robert H. Crabtree, Alan Bryan
Named For:  
Date Identified:  1952
Type Site:  The Sheep Island site, Chief Joseph Reservoir, Washington
Point Validity: Valid type

Osbourne is an anthropologist and Professor at the University of Washington.  Crabtree was served in many professional roles including Director of Archeology and Archaeological, Incorporated in California and Archaeologist for the BLM in Battle Mountain, Nevada. Bryan is an anthropologist and professor at the University of Alberta.  This type was named in a professional publication and has many professional references.  This is considered a valid type.
Columbia Plateau Barbed
Cluster:
Description of Physical Characteristics and Flaking Pattern:
This is a small to medium triangular expanding stem point with a flattened cross section.  The blade is primarily straight, but may vary from slightly excurvate to slightly incurvate.  The shoulders are barbed with pointed or sharp terminations.  The stem is expanding, but may vary to straight.  The base may range from straight to convex.  This point has a random flaking pattern.   
Size Measurements:

Total Length - 17 to 57 mm,  Stem Length - 4 to 6 mm,  Blade Width - 10 to 19 mm,  Neck Width - 3 to 6 mm,  Basal Width - 5 to 8 mm,  Thickness - 3 to 6 mm
Commonly Utilized Material:
Additional Comments:

Distribution:
Distribution Comments:

This point is primarily found in the lower regions of the Columbia Plateau, but may be found with decreased frequency into the mid to upper regions of the Columbia Plateau.
Age / Periods:
Date: 500 - 200 B.P.
Cultural Period: Classic to Historic
Glacial Period: Little Ice Age
Culture: Columbia Plateau Culture
Age Details:
Similar Points:
Calapooya, Eastgate, Gunther, Hells Canyon, Merrybelle, Plateau Horizon Corner Notch, Priests Rapids, Quilomene Bar, Rabbit Island, Rose Springs, Wallula
Other points in this cluster / Related / Associated Points:

Pictures: 

Pictures Provided By:
Larry Christian
Walter Williams (Sierra Artifacts)
Western Artifacts
Artifact Hunter
Windy City Artifacts

Columbia Plateau Projectile Point, Columbia Plateau Arrowhead
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References: (See Reference Page, Entry Number):

5, 23, 30, 50, 174