The rest is history. Fifty-five years later, the Hell Gap archaeological site is one of the most important archaeological discoveries in the western United States and that projectile point James Duguid found became a new projectile point type called Hell Gap.
|Figure Two. Winds of Eden, the third |
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on the Trail Quadrilogy.
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You might be asking, what is an Agate Basin projectile point and a Hell Gap projectile point? Good question! There will be more on the technological differences later in the blog, but for now please 'eyeball' Figure One above which shows two projectile points, both made from a rock type called Knife River Chalcedony which is found in North Dakota. The top projectile point is an Agate Basin and the bottom projectile point is a Hell Gap. The manufacturing process that led to Hell Gap projectile points was a time continuation of the well developed Agate Basin manufacturing process. The makers of Hell Gap projectile point simply terminated their production process sooner than the makers of Agate Basin projectile points.
Since this blog posting is about Hell Gap projectile points, let me briefly describe them. Hell Gap projectile points are medium to large lanceolate-shaped points that are similar to Agate Basin points, except that the Hell Gap has stem limitations and often times it has shoulders. On a Hell Gap projectile point, the stem is long and contracting. The Hell Gap projectile point has straight to concave side edges and a straight to concave basal edge. The stem edge is often ground and polished. The basal corners may be sharp to grounded. Let's now look at the Hell Gap example below.
|Figure Three. Side A of a Hell Gap spear / knife form from Colorado.|
Most investigators believe that 10,000 years ago is a good timeframe for when the Hell Gap Complex existed on the High Plains. As previously mentioned, the Hell Gap projectile point appears to have developed from the earlier Agate Basin projectile point type. In fact, the distinctive Hell Gap shoulder was beginning to develop on some Agate Basin projectile points.
|Figure Four. Side B of a Hell Gap spear / knife form from Colorado.|
In the book The Casper Site, Frison and Bradley (1974) noted a special bifacial reduction process on quite a few Hell Gap specimens from the Casper Site in Wyoming. They noted that Hell Gap knappers achieved the general shape and regularity of the biface through serial percussion thinning on one side with a hammerstone. Spacing was carefully controlled and thinning flakes ran across the surface of the biface, reaching or nearly reaching the other edge of the biface (overshot).
Then, the knappers turned the bifaces over and thinned them from the opposite edge, creating bifaces with cross sections resembling parallelograms. After serial percussion thinning, the Hell Gap knapper shaped and straightened the margins of the biface using direct percussion with an antler or hammerstone or by selective pressure flaking. Bradley found in his study of Casper Site Hell Gap projectile points that some knappers used percussion only while others selectively retouched with pressure, especially at the base of the biface. Ultimately, Hell Gap knappers ended up creating bifaces that were lens-shaped.
Figure Five - The Latest addition to my prehistoric adventure series.
Hell Gap knappers used platform isolation and moderate to heavy grinding to prepare the striking
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