2M 



A. J. JUKES-BROWNE ON THE RELATIONS OF 



lite- pit, it would appear to be as in fig. 3, though I had no means of 

 ascertaining the relative thickness of the strata represented. 



Erom the upper part of bed 2 in the above pit-section I extracted 

 the following fossils in an unphosphatized condition, which are quite 

 sufficient to show that the stratum belongs to the division of the 

 Upper Gault. 



Plicatula peetinoides, Sow. (common). 

 Avicula gryphceoides, Sow. 

 Pecten orbicularis, Sow. 



Lima globosa, Sow. 



Ammonites rostx*atus, Sow. (small). 



On the heap there was a paucity of fossils, with the exception of 

 Plicatula peetinoides, which was common. The smaller nodules were 

 very like those of Cambridge ; but the larger ones presented a curious 

 appearance, being evidently phosphatic septarian stones, hollow in 

 the middle, and split up by contraction-cracks, which contained 

 carbonate of lime. "When struck they fell into numerous small 

 cubical pieces. These nodules were a difficulty to me at first, until 

 I had broken up several, and saw that the debris were exactly like 

 the little angular fragments so common in the Cambridge bed and 

 often bearing small Plicatulce and Ostrece. A very little rolling 

 would suffice to break up these hollow nodules ; and thus the appa- 

 rent absence of these forms in Cambridgeshire is satisfactorily ex- 

 plained, while the quantity of coprolitic debris there existing is like- 

 wise accounted for. 



On the other side of the canal, near the village of Puttenham, 

 another pit has been opened showing the same succession. Here the 

 men were at work ; and I obtained from the foreman the following 

 fossils in black phosphate : — 



Ichthyosaurus campylodon, Carter. 

 Saurocephalus laaciformis, Harlan. 

 Otodus appendiculatus, Ag. 

 Ammonites rostratus, Sow. 



splendens, Sow. 



■ auritus?, Sow. 



Raulinianus, J)' Orb. 



cratus, Seeley. 



Belemnites minimus, Sow. 

 Solarium omatum, Sow. 



Hinnites trilinearis, Seeley. 

 Plicatula peetinoides, Sow. 



sigillina, Woodw. 



Spondylus gibbosus, If Orb. 

 Lima elongata, Sow. 

 Avicula gryphseoides, Sow. 

 Terebratula biplicata, Sow. 

 Serpula articulata, Sow. 

 Ventriculites quincuncialis, T. Smith. 

 Trochocyathus angulatus, Duncan. 



Mr. Sollas, to whom I showed the few " coprolites " I was able 

 to carry away from the heap, recognized among them one or two 

 Cambridge forms, as well as two specimens of Ventriculites quin- 

 cuncialis. This is, I believe, the first time Ventriculites have been 

 obtained from undoubted Gault. 



The nodule-bed does not here rest upon a level surface, but undu- 

 lates up and down, so as to remind one of the behaviour of the 

 Cambridge bed ; there was, however, this essential difference — that 

 the nodules were never accumulated in the hollows. The foreman 

 of the works fully appreciated this fact, which unfortunately was 

 not to his advantage, since the deeper working in the hollows did 

 not here repay him by a more abundant harvest of nodules, as it 



