Smithsonian miscellaneous collections . mmer of 1941 (Roberts, 1942) and test trenches byHibben in 1940 have produced a sequence of cultural material asso-ciated with the bones of animals, some of them now extinct. Althoughthe amount and variation of the material are disappointingly small,enough information has been gained to demonstrate four distinctcultural horizons. These horizons can be tied to the deposits of thesite as diagrammatically suggested in figure 9. The stratigraphicposition of the material is in accord with the conclusion of thearcheologist that it includes four different time
Smithsonian miscellaneous collections . mmer of 1941 (Roberts, 1942) and test trenches byHibben in 1940 have produced a sequence of cultural material asso-ciated with the bones of animals, some of them now extinct. Althoughthe amount and variation of the material are disappointingly small,enough information has been gained to demonstrate four distinctcultural horizons. These horizons can be tied to the deposits of thesite as diagrammatically suggested in figure 9. The stratigraphicposition of the material is in accord with the conclusion of thearcheologist that it includes four different time horizons separatedby intervals of varying duration. The oldest cultural horizon is represented by a single point, calledby Roberts (1942, p. 8 and fig. 2a) the San Jon point. It was foundin area 2 in association with the heavily mineralized bones of anextinct bison, probably Bison taylori (Roberts, 1942, p. 8 and ftn. 2).The point and the bone were embedded in a clayey-silt bed near the 24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 121. =1 to (0 J £ £ -V en CVJ _ Q. Q> Q) a> ( ) c c c O O o C N N N o uoi^e UUJOj uop ues 05 ^1/5 t CD ^ Q NO. I GEOLOGY OF THE SAN JON SITE—JUDSON 25 top of zone 3 of the San Jon formation (figs. 8 and 9). The uprightposition of articulated leg bones within the deposit suggests that theanimals died after miring in a shallow pond. The almost completeabsence of all but leg bones further suggests that the bulk of thecarcasses were removed by scavenging animals or by man (Roberts,1942, p. 8). A true Folsom point was found on the surface alonga ridge 500 feet to the north as indicated in figure 4 and plate this point was not found in situ it appeared to be ravelingout of clays belonging to the same horizon as that containing theSan Jon point. The horizon also contained fragments of bone similarin amount of mineralization to that associated with the San Jonpoint. The second horizon recognized contains the Collateral Yumapoints in asso
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