101 
the remains of Megalosaurus, Hyleosaurus, Iguanodon, &c. into 
a sea tenanted with Pliosaurs, and Ichthyosaurs, and Plesiosaurs, 
&c., then after depositing these heavy bones and their sand, the 
fine mud would still be carried out to sea, and with it some of 
the spoils of the land, as in the case of all river deposits. 
The sections at Wicken were simple, being ferrous sands 
with varying courses of nodules of phosphate of lime and pebbles 
sometimes united into a bed six feet thick, oftener subdivided by 
intervening sand into two or three beds of from a few inches to 
a foot or two thick. Under these and not well separated is a 
thin band rich in calcareous matter, often making it a hard con- 
tinuous agglomerate ; but it is extremely variable, and some- 
times disappears in small isolated concretions. These beds, 
which were spoken of as the Potton sands and Wicken beds, 
rest at Wicken partly on the white Upware limestone (usually 
called Coral Rag, but regarded by the author as not older than 
the lower part of the Kimeridge clay), and partly on a blue 
clay with Ammonites serratus, and near the top casts of Nucula 
and other shells, &c. in phosphate of lime. This blue clay the 
author regarded as Kimeridge clay, though the Ammonites 
serratus usually occurs lower in the series. Above the sands is 
the Galt, the actual junction not seen, though there are cracks 
in the sands a foot or two wide into which the Galt with its 
characteristic fossils has been squeezed. 
The author followed the Wicken beds to Harrimere, near to 
which place they form the bed of the river, as a hard dark grey 
fine sand agglomerate of shells and phosphatic nodules, The 
species were numerous; those collected are in the Woodwardian 
Museum. This probably represents the lower phosphate bed 
at Wicken. Up to the old West Water the phosphatic casts of 
Lucina, Myacites, Cyprina, Ammonites, &c. occurred plentifully 
in the bed of the river for two miles before its junction with 
the Cam. At Stuntney the hill is capped with a thin bed of 
nodules of phosphate of lime, like those at Wicken with similar 
