22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



cap and clays were laid down in the hollows in the top of the white 

 and buff cross-bedded sand filling the basinlike valley that had been 

 formed in the top of the Tertiary beds underlying the area. 



The question of the relationship and the correlation between the 

 two sequences is an important one. Although there are certain indi- 

 cations that are suggestively significant, more work is needed to 

 establish them as facts. On the basis of the similar circumstance 

 of the alluvium of the first alluviation in the plain sequence being 

 subsequent to a deposition of volcanic ash and the lowest alluvium 

 of the basin sequence resting on such material, that both contain 

 similar faunal remains, and that Folsom and possible Yuma points 

 are reported from them, it would seem that they are approximately 

 the same age. Because of the uncertain archeological evidence for 

 the presence of Folsom and Yuma material in the first alluviation 

 and of Folsom at the basin site such a tie can be regarded only as 

 highly tentative at best. There is an additional complication in the 

 nature of the Yuma points involved. If those from the first alluvia- 

 tion are the Indeterminate, even perhaps the San Jon type, the case 

 is much stronger than it would be if they are the Collateral or Eden 

 N'^alley form, as the latter definitely occurs in a much later horizon 

 at the basin. No doubt much of the difficulty will disappear when 

 there is more complete geologic and archeologic information from 

 which to draw conclusions. At present it is not possible to estimate 

 how long a period of time is represented by the first arroyo-cutting 

 cycle and the second period of alluviation ; hence it cannot be indi- 

 cated how many years before the 1300- 1540 second arroyo stage 

 the first alluviation ended. 



While studying the deposits in the valley floor some miles west 

 of the main site Mr. Judson found an interesting cache of 44 stone 

 implements. The artifacts, consisting of five large blades (pi. 8), 

 end scrapers, side scrapers, and flake knives (pi. 9), had been placed 

 in a hole beside a fire pit. The blades were lying side by side in a 

 line extending in a general east-west direction. The other specimens 

 were grouped around and above the blades in no particular order. 

 The fire and cache pits were exposed by the caving of a gully bank. 

 Their tops were 2 feet (61.0 cm.) below the present surface. The 

 overlying deposits consisted of a layer of structureless sand con- 

 taining numerous charcoal flecks, a layer of red-clayey sand, and the 

 layer of modern buff-white blow sand. The pits were dug into a 

 layer of water-laid buff-colored sand to a maximum depth of 8 inches 

 (20.3 cm.). This layer corresponds to the third alluviation period 



