Geology . have furnished excellent and convenient grounds for findingraw material for making stone implements. The distinct recognition of the two stages in the manufacture ofthe well known arrow-points, spear-heads, knives, etc., used by theknown aborigines of the country, and the strong evidence that mul-titudes of the ruder forms found in the river gravels were productsof the first stages of such manufacture, naturally raised the questionwhether there are any true paleolithic artefacs in North difficulties of discriminating between paleoliths and rejects,if indeed they can be di
Geology . have furnished excellent and convenient grounds for findingraw material for making stone implements. The distinct recognition of the two stages in the manufacture ofthe well known arrow-points, spear-heads, knives, etc., used by theknown aborigines of the country, and the strong evidence that mul-titudes of the ruder forms found in the river gravels were productsof the first stages of such manufacture, naturally raised the questionwhether there are any true paleolithic artefacs in North difficulties of discriminating between paleoliths and rejects,if indeed they can be discriminated, is illustrated by Fig. 571, one ofthe chipped blades of which has been regarded as a typical paleolith,while the other forms are rejects. Whether this close resemblancebe regarded as merely similitude or as actual identity, it is obvious THE PLEISTOCENE OR GLACIAL PERIOD. 509 that a special burden is thrown upon the geological evidences, andthat they must be essentially decisive in FlG. 571—A group of figures of chipped-stone artefacs, one of which has been regardedas a typical paleolithic implement, front and side view, while the rest were obtainedin three cases, from modern flint-shops of the region in which the supposed paleo-hth was found, while the fourth was traceable directly to the same shops. Thediscrimination between the paleolith and the rejects is left to the reader.(Holmes.) It has been found that by far the majority of the artefacs in thevalley gravels are buried in the superficial portions, or in talus slopes, 510 GEOLOGY. or in secondary deposits, many of which are comparatively the less superficial finds, many have been shown to be cases of second-ary burial by natural means. The usual modes followed by streams
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