part3] PLEISTOCENE DEPOSITS AllOl'M) CAM Kill 1)< , K. 21i> 



character, but are thinner, with straighter edges, and of finer 

 workmanship. One specimen deserves particular mention ; il is 

 very rough, but almost certainly of human workmanship. In this 

 Mr. Miles Burkitl agrees with me. It is of the character of a 

 rough racloir with bulb and platform. The interesting feature is 

 that it is made from a silicified oolite which Mr. Rastall has 

 identified with a Yorkshire rock, and it has therefore been formed 

 from a travelled boulder, like some of those mentioned by Sir John 

 Evans from the Brandon district. It is, consequently, of import- 

 ance as throwing some light on the* relationship of Palaeolithic .Man 

 to the • Glacial Period.' 



In addition to the foregoing- there are a large number of imple- 

 ments, which are definitely of Le Moustier character, including 

 small, triangular, thick-butted coups-de-poing, grattoirs, racloirs 

 (both single and double), and borers (figs. 3-7). Some of the 

 racloirs appear to be typical Levallois flakes, with facetted striking 

 platforms (tig. 3, p. 216). These implements are, on the whole, 

 less waterworn than those that are referred to an earlier date. 

 They are chiefly milk-blue or grey, sometimes light buff, and in 

 one or two cases mahogany-coloured. A few are ivory white, as 

 is also the ease with some of those of presumed earlier date. 



Unfortunately, I have obtained very few artefacts in situ ; 

 one, however, was a small, blue-black, triangular coup-de-poing of 

 Mousterian type, which was found 3 inches above the base of the 

 unevenly-hedded gravels of the North Pk (fig. 4, p. 217). Two 

 flakes found in the same basal gravel of this unevenly-bedded 

 series have the patina so frequent in the implements which I claim 

 to be of Mousterian age. 



No implement of the types referred to the earlier periods has 

 been found in situ, but one day I found, on a heap just dug from 

 the gravel at the northern corner of the pit, two implements, one 

 a coup-de-poing of Chellean type, the other a definite 'Chellean' 

 scraper of kidney-shape, with the scraping edge on the concave 

 side. These came, therefore, from a part of the pit where, as 

 already stated, the unevenly-bedded gravels appear to he absent. 



It would seem, therefore, probable that the Chellean and perhaps 

 the Acheulean types belong to the lower evenly-bedded series, and 

 those of Le Moustier character to the upper unevenly-bedded 

 series: additional evidence is, however, required before this conclu- 

 sion is definitely accepted. The important point is, that a gravel 

 with implements of Mousterian type occurs at a height of about 

 40 feet above the deposits containing ( 'orbicula and Hippopotamus. 



There seems to be no doubt that the latter deposits are the 

 older, and this points to a period of aggradation during and after 

 the formal ion of the Corbicula deposit. 



It is true that the Observatory Gravels were deposited in a valley 

 which is not the main ('am Valley, but one can hardly suppose 

 that the bottom of the tributary was at a very much higher 

 level than that of the main valley in it.-, vicinity, Eor the two 

 must have joined at no great distance below Cambridge. 



B '2 



