Reports & Proceedings — Liverpool Geological Society. 45 



showed that in. spite of present adverse circumstances there had 

 been a slight increase in the membership, and that the activities of 

 the Society had been well maintained. 



The President in his annual address dealt with "The Coral Types 

 of the Carboniferous Limestone ", and gave a very valuable and 

 helpful resume of the principal diagnostic characters of the different 

 genera. The lines of their evolution were traced, and their value as 

 zonal indices clearly shown. In this connexion a warm tribute was 

 paid to the work of the late Dr. Arthur Vaughan. The address was 

 fully illustrated by a beautifully drawn series of sections of the chief 

 types, and an excellent collection of specimens from North Wales 

 and elsewhere. 



2. November 14, 1916.— J. H. Milton, F.G.S., F.L.S., President, in 



the Chair. 



The following paper was read : — 



"The Pebbles of the Middle Bunter Sandstones of the Neighbour- 

 hood of Liverpool." By T. A. Jones. 



The author described the results of an investigation into the nature 

 of the rock types represented amongst the pebbles, which he roughly 

 classified under the following heads : Quartzites and Grits, Granites, 

 Mica Schist, Felstones, Tourmaliniferous Quartzites, Grits, Schists, 

 •etc., Fossiliferous Pebbles, and Miscellaneous. Attention has been 

 given chiefly to those bearing tourmaline, which collectively were 

 present in greater abundance than those of any other group, with the 

 exception of the Quartzites and Grits. The mineral was present in 

 great variety and quantity, and on the whole the rocks showed 

 marked similarity to those surrounding the granite masses of Devon 

 and Cornwall, with which they were perhaps still more strongly 

 linked by the discovery of a pebble of granite containing abundant 

 tourmaline in slender prisms, and small pinkish garnets. This rock 

 when crushed yielded splintery fragments of dark indigo blue 

 tourmaline, closely resembling those found amongst the heavy 

 density minerals of the finer material of the Triassic sandstones of 

 the district. A light ash-grey friable schist was also described, 

 which contained irregular grains of brown and blue tourmaline 

 apparently of clastic origin, which was also considered competent to 

 have furnished some of them. 



Three other varieties of biotite granite were found, two of them 

 with micropegmatitic structure. Twelve varieties of felstones had 

 been examined, all of acid type. Four contained tourmaline plenti- 

 fully, and two seemed to be tuffs rather than lavas. Among the 

 fossiliferous pebbles one of reddish quartzite containing a single 

 specimen of a small Orthis was recorded, the only example so far 

 known to the author from the local pebble beds. 



On the whole the assemblage of pebbles seemed substantially 

 identical with those of the Midlands as described by Professor 

 Bonney, although the tourmaliniferous group was judged to be of 

 greater importance. The paper closed with a brief discussion of the 

 possible sources of the pebbles, and the method of transport. 



