Allen points constitute one of the last Paleolithic cultural complexes. Similar to the climactic fluctuations that affected the Cody complex, the Allen people dealt with a continually changing environment. 

It was during this time that Bison Antiquus went extinct. For these groups, that would have been a large change as the next predominant species of bison was Bison Occidentalis which would have been smaller and in lesser numbers. The decline in bison numbers, compiled with degrading environment conditions likely meant more competition among groups on the plains.  

Allen Points

Unlike the stemmed Cody complex prior, Allen points return to thinned lanceolate shapes with deep, concave bases. They have diagonal flake scars across their surface

Other points possibly concurrent with Allen are Frederick and Andersen. This website does not have examples of those points, however I still would like to explain some differences. Firstly, the bases should be observed. Allen bases are much more concave, whereas Andersen are completely straight and Frederick are only slightly concave compared to the more extreme Allen. Andersen points are also much more elongated, than the shorter Allen point.