484) Geological Society : — 



Isle of Arran, at a point coincident with the al30ve-described pro- 

 truded mass of Silurian rock, ten miles distant; and he pointed out 

 that tli,e axes of the successive movements of palreozoic rocks of 

 Scotland appeared to correspond with this and with each other, in 

 having an E.N.E. strike. 



2. " On the Rock-basins in the Granite of Dartmoor," By G. 

 W. Ormerod, Esq., M.A., F.G.S. 



The district examined by the author may be regarded as a central 

 belt of this granitic district, occupying about one-third of Dartmoor, 

 and extending over the parishes of Gidleigh, Chagford, Morton 

 Hampstead, North Bovey, Withycombe in the Moor, Manaton, 

 Ilington, and Bridford. Mr. Ormerod has examined most of the 

 rock-basins occurring in this district himself, and made plans of them 

 from measurement. In describing them, he divided the district into 

 plots, by rivers and watersheds ; and he gave a slight notice of each 

 tor, if it possessed any features of interest. He also stated the 

 measurements of the basins from N. to S. and from E. to W., for 

 comparison ; as well as their characters, depths, &c., and the direc- 

 tion of their longest diameter. Vixen Tor, Mis Tor, Hounter Tor, 

 the Tolmen, Kestor R.ock, the Puclcie Stone, Middleton Hill, the 

 Logan Stone, Hell Tor, Ingstone Rock, and Yes Tor were more 

 especially described ; and the heights above the sea-level, — the 

 presence or absence of basins on the tors — and the relative shapes 

 and sizes of the basins were shown by tables. 



After observing that though probably in some cases used by the 

 "Druids," yet the basins were certainly not formed artificially, 

 Mr. Ormerod proceeded to explain the differences between the 

 " rock-basins " of the tors, and the " potholes " in the granite of the 

 bed of the Teign ; and to show that atmospheric causes alone had 

 caused the formation of the former ; and he pointed out the peculiar 

 kinds of granite that were liable to be so decomposed as to present 

 either saucer-shaped, flat-bottomed, or other shaped basins on the 

 surface. 



3. " On the Kelloways Rock of the Yorkshire Coast." By J. 

 Leckenby, Esq. 



The author traced this interesting deposit from a short distance 

 to the south of Gristhorpe Bay, where it is a very thin pisolitic 

 band, to Red Cliff, where it presents upwards of 20 feet of sandstones, 

 the upper part being fossiliferous. At other points also, near Scar- 

 borough Pier, at the Castle, and inland at Oliver's Mount, the Kel- 

 loways Rock has been found to yield numerous fossils, a list of 

 which the author appended, together with descriptions of some new 

 or little-known species of Ammonites from this deposit. 



April 14. — Prof. Phillips, President, in the Chair. 



The following communications were read : — 



1. "On the occurrence of Graphularia Wetherellii in nodules from 

 the London Clay and the Crag." By N. T. Wetherell, Esq., M.R.C.S. 



The author, having briefly explained the form and general cha- 

 racters of the Pennatula-like fossil named Graphularia Wetherellii 

 by MM. Milne-Edwards and Haime, described the circumstances 



