eight-rowed condition and wide, glabrous cupules; but 
positive identification as such cannot be made. There is 
a possibility that they may be of a different origin. For 
example, specimens resembling these and derived from 
mixtures of early Nal Tel and Chapalote come from El 
Riego Cave, excavated by R. S. MacNeish in the state 
of Puebla (unpub.). Archaeological Nal Tel, which is 
eight-rowed with wide but hairy cupules and dated at 
about 4445 years ago, comes from much nearer ‘Texas in 
the state of Tamaulipas in northeastern Mexico (Man- 
gelsdorf et al., 1956). 
The Davis site maize was originally dated by radio- 
carbon, using the ‘‘carbon black’’ method, at A.D. 398 
+175 (Johnson, 1951). More recently, the University 
of Michigan laboratory arrived at a date of A.D. 1307 
+150 for this site, a date which is more in accord with 
archaeological evidence, although it is somewhat later 
than expected (Griffin and Yarnell, 1963). The actual 
age for the site may lie between these two dates; per- 
haps a conservative guess would put it at ca. A. D. 800-—- 
1000. In any case, the date would not be too early to 
preclude Maiz de Ocho from having spread to the Davis 
Site from northern Mexico via the Southwest, the inter- 
pretation most compatible with the available data. This 
spread could very easily be an extension of the ca. A.D. 
700-1100 dispersal of Maiz de Ocho in the Southwest, 
but without Pueblo culture accompanying the maize to 
eastern Texas. 
At about A.D. 1000, the first sedentary horticultural 
complexes appear, apparently full blown, in the Central 
Plains, extending as far north as northern Nebraska. The 
best known of these cultures are the Upper Republican 
Aspect of central and western Nebraska and western 
Kansas, the Nebraska Culture of eastern Nebraska and 
northeastern Kansas, and the Smoky Hill Aspect of cen- 
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