(^ Proceedings of Philosophical Societies, [July, 



admeasurement of which is given,) he proceeds to notice the phae- 

 nomena of the basaltic range, and to observe the connection of 

 the indurated chalk with the basalt ; beginning at the south 

 near Belfast, where it is underlying, and almost in contact with 

 the basalt of Mount Divis, tracing it at various points north- 

 wards to Ben Evanagh, and higli up in Benbradda, and de- 

 scribing the gypsiferous marie, having the same dip (30° NW.) 

 and line of direction as the chalk ; next to which, and between 

 it and the basalt, there is generally a thin stratum of ochre. 

 To the south of the line of chalk, and resting on the Dromore 

 porphyry, a highly indurated argillaceo-sihceous schist is found, 



Eassing by various shades into a claystone porphyry, being, 

 owever, m its simple state harder than the basis of the por- 



The author concludes by giving his opinion that the density 

 and crystallized structure of basalt are not affected by the amount 

 of pressure, and stating that he has not been able to make out 

 any decided proof of the stratification of that rock. 



Jutie 2. — A paper, entitled. On the Freshwater Strata of 

 Hordwell, Beacon, and Barton CUfFs, Hants, by C. Lyell, Esq. 

 FGS., was read. 



The author, after confirming Mr. Webster,s discovery of a 

 distinct freshwater formation on the Hampshire coast, cor- 

 responding with the lower freshwater formation in the Isle of 

 Wight, states, that in consequence of the suspicions entertained 

 of the possible occurrence of the upper marine formation in 

 some of the upper strata of Hordwell cliffs, he has examined 

 the beds ; a minute detail of which, in their order of superpo- 

 sition, together with the organic remains peculiar to each, is 

 given. Bituminized wood, seeds, and capsules of plants (among 

 them Carpolithes thalictroides, Brongnt.), with freshwater shells, 

 ttbound therein ; and, in a bed of calcareous marie, sometimes 

 slightly indurated, from 6 to 8 inches thick, and consisting of 

 an aggregate of Planorbes and JLymricccCy an abundance of Gy- 

 rogonites iChara Medicagiriula) w&s found. In the bed imme- 

 diately above were discovered the scale of a Tortoise, and the 

 teeth of a Saurian, probably a Crocodile. — From the presence of 

 two species of ISerpula the author supposes that this series of 

 strata might have been formed in an estuary. The shells, from 

 the occurrence of which the existence of marine strata in Hord- 

 well cliff had been before inferred, prove to be species of Pota- 

 midesy a freshwater genus ; and the beds which lie above these 

 are exclusively freshwater. 



Of the new organic remains, the valves of a Cj/pris, smaller 

 than that found in the Weald clay, but in as great proportion, 

 are characterized as the most interesting, and a small Aricylus is 



