NO. lO SECOND REPORT ON EOLSOM COMFM-EX ROBERTS 9 



a smaller trench was dug through the area east of sections 3 to 5. This 

 work revealed that the artifact-bearing layer there was on a slope 

 dropping away from the ridge. 



The black layer appeared again in section 9 and continued un- 

 broken, though varying in thickness from section to section, through 

 to the ravine. At first it was thought that the greater depth of the cul- 

 tural layer in sections 10 to 13 was due to the washing down of ma- 

 terial from the area above. Evidence of water action was not apparent, 

 however. There undoubtedly was some drift from the higher ground 

 but not in sizeable quantities, and the increase in thickness may pos- 

 sibly be explained by the fact that the black stratum overlay a slight 

 declivity in the top of the old clay bed in sections 11 and 12. 



The lower sections in trench A demonstrate clearly the factors in- 

 volved in the filling of the old valley and the raising of the surface 

 level from that occupied by the makers of the implements to the pres- 

 ent top of the ground. There are numerous layers of water-deposited 

 material and evidences of the shifting of intermittent stream beds. 

 Various soil lines indicate intervals when conditions were static and 

 vegetation flourished unhampered by material carried down from the 

 higher slopes. In the upper levels of sections 17 to 22 an old stream 

 bed is clearly shown. It was cut, the water course shifted, and the 

 channel filled before the present ravine became a feature of the terrain. 

 Despite the fact that conditions in the West are such that cutting and 

 filling may take place at a rapid rate, considerable time is probably 

 represented by the accumulation in the valley bottom. 



A few interesting things may be noted regarding the occurrence of 

 specimens. The most prolific sections in the yield of implements were 

 12 to 16, the greatest number coming from 16. The largest amount 

 of chipper's debris centered in 13, 14, and 15. In section 15 one series 

 of flakes totalling iii was found in a 4-inch (10.16 cm) radius, with 

 78 of the chips in a single pile. Nearby were some hammerstones, and 

 several broken implements occurred in the material from the section. 

 All the fragments from these implements were obtained, and it was 

 possible to restore them. In the lot was a Folsom point represented by 

 two pieces found 4 feet (1.2 19 m) apart. Section 14 yielded the only 

 definitely worked piece of bone, a thin disk with a series of lines cut 

 around tlie edge. The percentage of implements by sections is as 

 follows: I, 3.6 percent; 2, 5.3; 3, 2.5; 4, i.i ; 5, i.i ; 6, o; 7, 0.4; 

 8, 0.4; 9, 1.8; 10, 3.6; II, 3.6; 12, 7.8; 13, 10.6; 14, 7.5; 15, 8.5; 

 16, 14.5 ; 17, 3.6; 18, 3.1 ; 19, 3.6; 20, 0.4; 21, I.I ; 22, 0.4; 23, 2.1 ; 

 24, 2.1 ; 25, 6.7 ; 26, 4.6. The material from the deep pit in the ravine 

 bank is not included in these figures because the work done there was 



