THE PLEISTOCENE OR GLACIAL PERIOD 927 



America, are to be sought, viz., (1) in undisturbed till-sheets below 

 horizons affected by surface intrusion, and (2) in interglacial beds, 

 where overlain by till and protected from all assignable sources 



Fig. 604. A group of figures of chipped-stone artefacs, one of which has 

 been regarded as a typical paleolithic implement, front and side view, 

 while the rest were obtained, in three cases, from modern flint-shops 

 of the region in which the supposed paleolith was found, while the 

 fourth was traceable directly to the same shops. The discrimination 

 between the paleolith and the rejects is left to the reader. (Holmes.) 



of subsequent intermixture. Both these classes of beds have 

 yielded fossils of other forms of life, and these alone have been 

 seriously considered in the usual studies of the life of the glacial 

 and interglacial stages. These beds have not yet yielded human 



