1 06 PREHISTORIC E UR OPE. 



levels are analogous to those found at Montaigle ; they are 

 rudely shaped and finished, and half-finished specimens occur 

 in large numbers. Many of these spoiled implements are made 

 of the black marble of the district — the others are of flint. 

 Points or arrow-heads fashioned of reindeer's horn are also met 

 with. The implements got in the upper bone-beds or " floors " 

 are not of the rude form and finish of the Montaigle type, but 

 consist of long well-shaped flakes of flint (so-called " knives "). 

 Others again are furnished with a "peduncle," as if they were 

 meant to be sunk into a shaft of wood and used for spearing 

 purposes. Their workmanship indicates decidedly more skill 

 than that of the implements obtained from the lower levels in 

 the same cave. But the most remarkable " finds " in the upper 

 floors consist of portions of reindeer's horn showing etchings or 

 engravings, which have been traced by some sharp point — no 

 doubt, by a flint implement. One small bit of horn has been cut 

 or scraped so as to present the rude outline of a human figure. 



Another of the more interesting caves that occur in the 

 valley of the Lesse is the Trou de la Naulette, which has been 

 occupied at separate times by men and wild beasts. The en- 

 trance to this cave is about 90 feet above the level of the river. 

 The floor is covered with 36 feet of fluviatile silt — the lower 

 portion of which was deposited at a time when the Lesse flowed 

 at the level of the entrance, while the upper portion consists of 

 flood-accumulations carried into the cave at a time when the 

 river at its normal level had ceased to reach the entrance. 

 These flood-accumulations consist of seven separate beds or 

 layers which are separated by an equal number of stalagmitic 

 pavements. The latter of course indicate periods of more or 

 less duration during which there were no inundations, and the 

 cave remained dry. Bones are met with above the first, second, 

 and seventh stalagmitic floors. Those of the first layer indicate 

 that the cave was at that time a hysena's den, which is proved 

 by the presence of remains of that animal together with abun- 

 dance of gnawed bones of various ruminants. The second bone- 

 bed affords evidence that during its accumulation the Trou de 



