NO. lO NEBRASKA AKCHEOLOGY STRONG 281 



quence of Yuma and Folsom type points is still an open one. In this 

 regard it should be mentioned that at least one typical Yuma point 

 (NDa) was found beneath the surface on Signal Butte. (Examined 

 by the writer in the collection of the finder, Ray Swanson, Scottsblufif, 

 in August 193 1 ; see also Renaud, 1934 a, p. 39.) 



In the bison quarry below Signal Butte, on Spring Creek, Schultz 

 found a typical Yuma point (NDa) in association with two, un- 

 grooved, leaf -shaped points (NAb 1-3, exact classification uncertain 

 owing to broken bases), a stemmed point (SCa3), and a planoconvex, 

 end scraper with a rough back. Barbour and Schultz ( 1932 b) classify 

 the Spring Creek artifacts as of a " Pre-Folsom Culture " but, for 

 the following reasons, I am unable to agree with such a classification. 

 With the exception of the Yuma type point the remaining definite 

 artifacts from Spring Creek all fit into the Signal Butte I artifact 

 series (see table 3, p. 90), and, as previously noted, the Yuma type 

 of point has been reported from Signal Butte as well. This definite 

 association in the Spring Creek quarry between the Yuma type of 

 point (NDa) and a stemmed point (SCa3) seems very significant. 

 On Signal Butte it is clear that stemmed points are in a minority in 

 Signal Butte I and come into greatest vogue in Signal Butte II, where- 

 as so far they are unknown from the true Folsom culture. The in- 

 ference is obvious that the stemmed type is generally a later form than 

 the leaf -shaped. However, the inclusion of a definite Yuma (NDa) 

 point, which at best is very rare in any Signal Butte levels, with other 

 types which are common in Signal Butte I, suggests that culturally 

 the Spring Creek artifact complex may be somewhat earlier than 

 Signal Butte I, but is probably later than the true Folsom culture. 

 This suggestion is supported by the fact that the Spring Creek bison 

 are of an extinct species, whereas the fragmentary bison remains on 

 Signal Butte cannot be distinguished from those of the recent bison. 

 It should be remembered, however, that Bison bison apparently lived 

 in the late Pleistocene as well. (Romer, 1933, p. 70.) As to geo- 

 logic age, Lugn (1934) has recently suggested that these Spring 

 Creek deposits belong to a " post-Kansas pre-Wisconsin " Pleistocene 

 horizon. In the light of the marked cultural associations between the 

 Spring Creek artifacts and those from Signal Butte I, this dating 

 seems improbable unless the lowest horizons on Signal Butte are much 

 older than is believed at present. Owing to the im^wrtance of the 

 problems involved, the present writer believes that more detailed 

 geologic evidence must be presented than is now available (Barbour 

 and Schultz, 1932 b, and Lugn and Schultz, 1934) before this pro- 

 nouncement can be unreservedly accepted. 



