PROCEEDINGS OF GEOLOGICAL SOCIETIES. 



211 



Stone, Coal-measures, and Pennian sandstone in the Isle of Arran, at a point 

 coincident with the above-described protruded mass of Silurian rock, ten miles 

 distant ; and he pointed out that the axes of the successive movements of palaeozoic 

 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 Gr. W. Ormerod, Eyq., 

 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, Withy combe 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 measure- 

 ment. In describing them, he divided the district into plots, by rivers and water- 

 sheds ; 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 direction 

 of their longest diameter. Vixen Tor, Mis Tor, Hounter Tor, the Tolmen, Kestor 

 Rock, the Puckie Stone, Middlcton 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 

 th'3 basins were showa by tables. 



After observing that though probably in some cases used by the " Druids, " yet 

 the basins were certainly not formed artificially, Mr. Onnerod proceeded to explain 

 the differences between the "rock-basins" of the tors, 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 ; he further 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. 

 Communicated by J. Morris, Esq., F.G.S. 



The author traced this interesting deposit from a short distance to the south of 

 Gristiiorpe Bay, where it is a very thin pisolitic band, to Red Clitf, where it 

 presents upwards of 20 feet of sandstones, the upper part being fossiliferous. At 

 other points also near Scai-borough Pier, at the Castle, and inland at Oliver's Mount, 

 the Kelloways 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. 



[This paper was illustrated by a series of fossils from Mr. Leckenby's 

 Collection.] 



April 14. — 1. " On the occurrence of Graphularia Wethercllii in nodules 

 from the London Clay and the Crag." By N. T. Yv^etherell Esq., M.R.C.S. Com- 

 municated by the President. 



The authoi', having briefly explained the form and general chaiacters of the 

 Pennatula-like fossil named Graplmlaria Wetherellii by MM. Milne-Edwards and 

 Haime, described the circumstances under which he had lately found portions of 

 the stem of this coral traversing nodules in the London Clay of Highgate. The 

 nodules are of various sizes, and vary from a cylindrical to an ovoidal shape, 

 Mr. Wetherell having also observed unmistakeable fragments of the same 

 Graphularia holding the same relative position in nodules from the Red Crag, 

 dift'ering from those of the London Clay only in having been more rounded and 

 polished by aqueous action, brought the subject before the Society as a link in the 

 chain of evidence of the so-called " coprolitic " or phosphatic nodules of the Red 

 Crag having been to a great extent derived from the destruction of the London 

 Clay. The author also offered some observations on the structure of other nodular 

 bodies in the London Clay and in other deposits. 



2. " On the Extraneous Fossils of the Fvcd Crag." By S. Y. Wood, Esq../ 

 F.G.S. 



