676 ROLLIN T. CHAMBERLIN 



excepted the turtles, but the finding of one very firm carapace near 

 the junction of the two deposits would seem to throw much doubt 

 upon arguments based upon the turtles. If it be admitted, then, 

 that such of these fossils as cannot readily have been transported 

 from elsewhere since fossilization are primary to the lower creek 

 deposit, that would mean that this earlier creek filling is of the 

 same age as these particular types, and so its age is determinable 

 from these types provided they afford decisive evidence. But a 

 development of scarcely less significance in the ultimate interpre- 

 tation was the bringing out of this very fact that the undisturbed 

 specimens of extinct vertebrates were taken wholly, or chiefly, from 

 the lower creek deposit. 



On the other hand, according to the published accounts of 

 Dr. Sellards, the bones of the extinct vertebrates found in the 

 upper creek deposit are much scattered, commonly a few teeth, or 

 a lower jaw, or fragments of one or two other bones. 1 In this con- 

 dition they do not seem to the writer to preclude more or less 

 reworking by the creek, but rather to imply it. 



Next let us consider the location of the human bones and 

 artifacts. On the north bank of the canal the human relics thus 

 far found have come exclusively from the upper creek deposit. No 

 evidence of the presence of man has yet been discovered in the 

 lower creek deposit on the north bank of the canal. At the same 

 time it strikes the writer as an observation equally to be emphasized 

 that the two creek deposits are quite distinct from one another 

 throughout this section along the north bank of the canal. In this 

 section the observer feels little hesitation in drawing the dividing 

 line, and different investigators readily place it at the same level. 

 It can scarcely be without significance that the human relics found 

 thus far in the north bank of the canal all lie above this well-marked 

 dividing line, while the vertebrates of greatest age, and those which 

 present the best basis for the claim that they cannot have been 

 rewashed, lie below this line. 



All the human relics reported to have come from the lower 

 creek filling were found in the south bank of the canal, and were 



1 E. H. Sellards, "Human Remains and Associated Fossils from the Pleistocene 

 of Florida," Eighth Ann. Rept. Florida Geol. Surv., 1916, pp. 147-52. 



