Vol. 52.] MAMMALIAN REMAINS IN DEE WENT RIVER-GRAVELS. 



507 



smoothed off, and it is difficult to resist the conclusion that the 

 agent which contorted the gravels hereabouts (produced the ' under- 

 plight ') — fig. 5 — also obliterated the terraced aspect of the ground. 



The excavation of the Sinfiu Moor area is also a difficulty. It 

 is an almost perfectly flat plain, about 1 square mile in area, 

 covered by more than 8 feet of shell-marl, peat, and fine clay. The 

 surface is at about the same level as the alluvial plain of the 

 Derwent (see fig. 3, p. 502), and only about 4 or 5 feet above the 

 low-level plain of the Trent. It cannot have been excavated by 

 running water, for it was once a lake which had been drained 

 by the deepening of the Trent Valley. Nor does it show any 

 sign of having been produced by earth-movements. The Allenton 

 terrace, for instance, does not appear to have been locally de- 

 pressed, although the gravel approaches to within | mile of the 

 hollow, and is only separated from it by a low ridge. On its 

 southern side Sinfin Moor is separated by a much higher ridge (also 

 capped by gravel running at definite levels) from the Trent Valley. 

 The moor waters drain into the Trent through a narrow short valley 

 between Chellaston and Swarkstone. The depression could not well 

 have been in existence when the Allenton terrace-gravels were being 

 formed, for if it had the lake would have been a deep one, and no 

 high-level terraces or deltaic deposits have been found to support 



