TRANSACTIONS 0¥ THE SECTIONS. 73 



0)1 the Internal Heat of the Earth. By Dr. Julius Schvarcz. * 



On the Relation of the Upper and Lower Crags in Norfollc. 

 By J. E. Taylok, Eon. Sec. Nonvich Geol. Soc* 



On a new Phosphatic, Deposit near Upware, in Cambridgeshire. 

 By J. P. Walker, B.A., F.G.S. Sfc. 



At the Meeting of this Association at Nottingham, the author conimnnicated a 

 paper on a phosphatic deposit in Bedfordshire; further light has been thrown 

 upon the nature of that bed by the discovery of another deposit near Upware. 

 The most remarkable difference between these deposits is, that the shells, which the 

 author regarded as proper to the beds, exist'at Sandy and Pottou in a ferruginous 

 condition, but in a calcareous condition near Upware. The reason why the same 

 fossils occur in different conditions in these beds is probably due to the proximity 

 of a coral-reef to the Upware bed ; for the coral rag occurs at Upware, and a large 

 supply of calcareous matter would be derived from this source. At Sandy the 

 casts of the shells are impressions in the ferruginous sand, which forms the matrix 

 in which the fossils and nodules are imbedded, whilst at Upware casts of these 

 shells occur composed of carbonate of calcium. The author referred to the water- 

 worn condition of the phosphatic casts at Potton in his former paper, but the fer- 

 ruginous nature of that bed was unfavourable for the preservation of the shells 

 proper to the deposit ; in the Upware bed, however, the calcareous nature of the 

 deposit is highly favourable for the preservation of the shells proper to the deposit ; 

 and therefore the difference between the phosphatic casts and the shells proper to 

 their respective beds is more marked at Upware than, at Potton. Bnjozoa, Scrindce, 

 &c. occur on several of the phosphatic nodules at Upware, having evidentlj^ grown 

 on them, the animal having followed the outline of the nodule, which circumstance 

 would tend to show that the nodules have been deposited in a hardened condition 

 in the place where they are found. 



Eemains of the same fishes that are found in the Bedfordshire deposit occur in 

 this bed ; also of the reptiles, including Dakosaurus and Iguanodon. 



The author gave sections of the Upware deposits in the ' Geological Magazine ' 

 for July 1867, also a list of the fossils ; among these there are a great many species 

 of Brachiopoda, including three new species — W. Wooclwardii, W. Davidsoiiii, and 

 T. Dallasii (since described in Geol. Mag. October 1867). 



The known species of Brachiopoda found in this deposit are of the Lower-Green- 

 sand age, including T. Sella, T. lyrcelonga, T. depressa, T. Fittoni, W. 3Iotitoniajut, 

 &c., R. Gibhsiana, R. antidichotuma, &.c. This bed likewise contains mmaerous 

 fine specimens of sponges, Bryozoa, kc, resembling those found at Faningdon ; 

 and during a recent visit to the latter locality the author obtained several shells 

 which he has also found at Upware. The author considered these beds at Potton 

 and Upware to be a drift of the age of the Lower Greensand, containing fossils of 

 that age as well as extraneous specimens. 



On some Carboniferous Fossil Trees imbedded in Trappean Ash in the Isle 

 of Arran. By E. A. Wunsch. 



On the Gradual Alteration of the Coast-line in Norfolh. By J. "Wtatt. 



* See Appendix. 



