Outline is Representative of Size and Shape:

Saginaw

Swan Creek


Midland
Name Details:
Identified By:  Lewis R Binford
Named For:   Type Site
Date Identified:  1963
Type Site:  Pomranky Site, Midland County, Michigan
Point Validity: Valid type

Binford was an influential anthropologist who fundamentally changed the field of archaeology with the introduction of processional archaeology of "New Archaeology".  He was a professor at the Southern Methodist University and later the University of New Mexico.  This type was named in a professional publication and has many professional references.  This is considered a valid type.
Pomranky Triangle
AKA: Midland, Swan Creek, Saginaw
Cluster: Eastern Archaic Triangle Cluster
Description of Physical Characteristics and Flaking Pattern:
This is a medium triangular point with an elliptical cross section.  The blade is excurvate with some example having parallel sides.  The basal edges are rounded.  The base may range from concave to convex or asymmetrical base.  This point has a random flaking pattern.
Size Measurements:

Commonly Utilized Material:
Additional Comments:

Binford (1963) lists three variants:
Midland Variety: has a straight to concaved base
Swan Creek Variety: Has rounded basal edges and a convex base
Saginaw Variety: Smaller with irregular base
Distribution:
Distribution Comments:

This point has the heaviest concentration in Michigan in though out the Great Lakes Region.
Age / Periods:
Date: 3,300 - 2,500 B.P.
Cultural Period: Late Archaic to Early Woodland
Glacial Period: Neoglacial
Culture: Late Red Ocher Complex
Age Details:
Similar Points:
Decatur Blade, Levanna, Susquehannock Triangle
Other points in this cluster / Related / Associated Points:
Meadowood
Pictures: 

Midland Triangle


Swan Creek Triangle


Sagnaw Triangle
Pictures Provided By:
Polly Armstrong
Riley Beach





Pomranky Projectile Point, Pomranky Arrowhead
Midland Projectile Point, Midland Arrowhead,
Swan Creek Projectile Point, Swan Creek Arrowhead,
Saginaw Projectile Point, Saginaw Arrowhead
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References: (See Reference Page, Entry Number):

23, 37