Outline is Representative of Size and Shape:
Name Details:
Identified By:  Frank J. Soday (Fluted)
Robert E. Bell (Un-Fluted)
Named For:  Type Site
Date Identified:  1954 / 1960
Type Site:  Quad Site, Limestone County, Alabama
Point Validity: Valid type

Soday was a well-respected archaeologist conducted numerous surveys and excavations and is well published.  He served as the president of the Alabama Archaeological Society.  Bell was a professor of anthropology and Museum Curator in Oklahoma and did extensive work at the Spiro Mounds.  This type was named in a professional publication and has many professional references.  This is considered a valid type.
Mendocino Concave Base
Cluster: Humboldt Cluster
Description of Physical Characteristics and Flaking Pattern:
This is a thick medium lanceolate point with an elliptical cross section.  The blade has a  excurvate shape.  The base is concaved to notched.  The classic flaking pattern is oblique transverse, but also may have a random flaking pattern.
Size Measurements:

Total Length - 23 to 75 mm (average 35 to 45 mm),  Max Blade Width - 11 to 43 mm,  Basal Width - Slightly narrower than blade,  Basal Concavity - 3 to 6 mm,  Thickness - 6 to 10 mm
Commonly Utilized Material:
Additional Comments:

Thought to be a northwestern California variant of the Humboldt point (Justice, 2002).

These points have been found with and confused with Albion Head points and preforms.  These points are thicker and larger with a deep concave compared to shallow notched Albion Head points and preforms (Justice, 2002).

This point is considered to be a variant of the Humboldt point.  The Humboldt type has a Great Basin distribution while this point has a central and coastal California distribution.  It has been suggested that the Mendocino Concave and the Humboldt may represent the same type.
Distribution:
Distribution Comments:

This point is primarily found in the northern coastal regions of California (red).  This point is considered a regional variant, or possibly the same type, of the Humboldt point which has a Great Basin distribution (yellow)
Age / Periods:
Date: 5,000 - 2,500 B.P.
Cultural Period: Middle Archaic
Glacial Period: Middle Holocene to Neoglacial
Culture:
Age Details:
Similar Points:
Albion Head, Buchanan Eared, Humboldt
Other points in this cluster / Related / Associated Points:
Buchanan Eared, Humboldt Constricting Base, Humboldt Basal Notched, Humboldt, Humboldt Expanding Base
Pictures: 

Pictures Provided By:
Johnny Evans
Glinda Addington
Zack Hansen
Walter Williams (Sierra Artifacts)
Western Artifacts
Rob of the Rock




Mendocino Concave Projectile Point, Mendocino Concave Arrowhead
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References: (See Reference Page, Entry Number):

16, 23, 30, W1