Gravels of Intermediate Terrace 47 



passes up into ordinary gravelly loam and surface soil. The 

 total thickness is about eight to ten feet. The great majority 

 of the bones from the basal silt are those of Hippopotamus 

 and several good head n a f it have been found. Bones and 

 especially teeth of Rhinoceros and the Urns (Bos primigenius) 

 are quite common. Mammoth, horse and several species of 

 deer are not rare, and the lion, the hyena, and the bear have 

 been found. 



With these are also found large numbers of land and fresh 

 water molluscs of which about ninety species have been 

 recorded. Of these some eighty are still to be found living 

 around Cambridge, but such forms as Unio littoralis and 

 Cyrena fluminalis are not known nearer than France and 

 Sicily. 



The upper bone bed contains only bones of Bos and 

 Bison. 



The gravels of the Intermediate Terrace are best seen in 

 the pits at Chesterton. They underlie the greater part of 

 Cambridge town, and extend by Newnham and Brooklands 

 along the west side of the railway to Shelford, where they 

 become inseparable from the later gravels. Similar gravels 

 can also be followed along the Ely road by Milton to Water- 

 beach and Landbeach where they gradually merge into feu. 



The best exposures are those provided by the large gravel 

 pits near the Railway Bridge at Chesterton. The beds are on 

 the whole very like the Barnwell series but their stratification 

 is much more regular, and alternations of coarse and fine 

 material are less frequent. Other good sections may be seen 

 near the Slap Up Inn, close to Waterbeach. 



Rolled bones and a few mollusca are occasionally found in 

 both places but are not at all distinctive ; Ekphas and Rhino- 

 ceros occur. 



The Lowest Terrace is the most continuous and the least 

 distinct of all, and rises but little above the modern flood 

 level. Gravels referred to it fringe both sides of all the 

 tributaries of the Cam almost to their sources and sometimes 



