310 



Walker — Coprolite Workings at Upware. 



come blended into one, but the top layer dififers in the nodules, being 

 of a much lighter color, and I was informed that they were less 

 valuable. 



The hard rock (conglomerate), consisting of nodules and pebbles, 

 cemented together chiefly by carbonate of calcium, varies consider- 

 ably, sometimes being so firm as to be penetrated -wath difficulty ; at 

 other times the coprolites near the clay are easily worked. The 

 Kimmeridge Clay is not pierced, as there is no occasion for a well, 

 the works being near the river. Among the nodules there are found 

 phosphatic shells, as in the bed near Potton. They consist of frag- 

 ments of Ammonites, (and some of the nodules are marked by impres- 

 sions of Ammonites( casts of brachiopoda, conchifera and gasteropoda, 

 also remains of large Belemnites and GrypJioea dilatata, composed of 

 carbonate of calcium, occur, derived from the Oxford Clay. 



I have obtained the remains of most of the fishes and reptiles 

 found at Sandy. 



Sphcerodus gigas Ag. 



GyroduH 



J ster acanthus ornatissimus Ag. 



Py modus gigas? 



Sybodus (Spine and Sphenonchus). 

 Psammodus reticulaius Ag. 

 Edaphodon. 



Of reptiles, the remains of Pliosaurus, Ichthyosaurus, Plesiosaurus, 

 Dahosaurus, and a tooth of the Iguanodon, have been discovered. 



The fossils proper to the bed consist of carbonate of calcium, thus 

 differing from the ferruginous shells of the Sandy conglomerate bed. 

 Sometimes masses of these shells are found cemented together, 

 chiefly in the lower part of the deposit. There are found large 

 sponges, bryozoa, serpulao, etc. ; the commonest shell is Terehratula 

 sella, of which numbers can be obtained of the workpeople, but on 

 examining the heaps it does not appear to be so plentiful. I have 

 obtained the following species : — 



Belemnites, sp. 



Scalana, sp. 



Cerithium, sp. 



Turbo, sp. 



Nerinea, sp. 



Trochus, sp. 



Opts neocomiensis, d'Orb. 



Cardium, sp, 



Cyprina, sp. 



Trigonia spinosa, Park. 



Pecten cottaldianus, d'Orb. 



„ Carteronianus, d'Orb. 

 Janira neocomiensis, d'Orb. 

 Plicatula Carteroniana, d'Orb. 

 sp. 



Rh nchonella Gibbsiana, Sby. 



,, antidichoiotna. But. 



,, paucicosta ? (T^vohably new). 



„ depressa. 



,, nufiiformis, Sby. 



Terebrirostra neocomiensis, d'Orb. 

 Terebratella oblonga (small variety). 

 Terehratula sella, Sby. 



,, prcelonga, Sby. 



„ depressa, Lam.* 



„ hippopus, d'Orb. 

 T. ( Waldhimia) tamarindus, Sby. 



„ celtica, Mor. 



,, mouloniana, d'Orb. 



Bryozoa, etc. 



Serpulce. 



Osirea macropiera, Sby. 

 Ostrea, sp. 



* The largest specimen of T. depressa ? I have obtained is 2-8 inches long, 2'o 

 inches in width, and 1-1 inch in depth. 



This bed, and the conglomerate bed near Potton, appear to be of 

 the same age, and probably, also, the Farringdon beds, viz.. Lower 

 Greensand, containing large numbers of fossils derived from other 

 formations. 



