Outline is Representative of Size and Shape:

Name Details:
Identified By:  Thomas Kehoe
Named For:  Creek in Montana
Date Identified:  1966
Type Site: 
Point Validity: Valid type

Kehoe is a professional anthropologist who worked extensively on archeology of Montana and served as both a professor and curator at the Museum of the Plains Indian at Browning Montana.  This type was named in a professional publication.  There are limited professional references, this may be due to most of these points are typed as Plains Side Notch and not broken down into the variants.  This is considered a valid type.  
Cut Bank Side Notch
AKA: Cut Bank Jaw-Notched
(Plains Side Notch Variant)
Cluster: Plains Side Notch Cluster
Description of Physical Characteristics and Flaking Pattern:
This is a thin small side notch point with a flattened cross section.  The blade is primarily straight, but may vary to slightly excurvate.  Parallel U-shaped notches enter the blade forming horizontal shoulders and an expanded stem.  The notches are wider towards the bottom of the notch and narrower at the blade.  The base is slightly concave. The basal edge is generally contracting from the notch to the base and has rounded basal corners.  This point is generally well-made and has a oblique parallel to random flaking pattern. 
Size Measurements:
Length - 10 to 34 mm (20.6 mm mean), Width - 9 to 18 mm (14.2 mm mean), Thickness - 2 to 7 mm (2.6 mm mean)
Commonly Utilized Material:
Additional Comments:

The key characteristic of this type is the notch being narrower at the blade than the further in the notch.

Plains Side Notch variants as described by Kehoe (as illustrated 1966)
1. Plains Side Notch (Primary type) 2. Billings, 3. Buffalo Gap, 4. Cut Bank, 5. Emigrant, 6. Paskapoo, 7. Pekisko, 8. Washita
Distribution:
Distribution Comments:

This point is primarily found in the northern plains region of Montana, South Dakota, North Dakota, into eastern Colorado, northern Nebraska, and into southern Saskatchewan and Alberta.
Age / Periods:
Date: 600 - 200 B.P.
Cultural Period: Classic to Historic
Glacial Period: Little Ice Age
Culture:
Age Details:
Similar Points:
Buffalo Gap, Cayley, Cluny, Emigrant, LookingbillMortlach, Pekisko, Washita
Other points in this cluster / Related / Associated Points:
Billings, Buffalo Gap, Emigrant, Pekisko, Paskapoo, Washita
Pictures: 

Pictures Provided By:
ut Bank Projectile Point, Cut Bank Arrowhead, Cut Bank Notched-Jaw


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References: (See Reference Page, Entry Number):

23, 30, 64, 176