The Geological Structure of the Southern Mdlverns, Sfc. 327 



the upper conglomerate was found to be slickensided. The way in 

 which the surfaces of some of the pebbles have been squeezed-off 

 suggests the possibility that their angular shape may be partially 

 or wholly due to earth-movement. 



2. ' Geology of the Great Central Railway (New Extension to 

 London of the Manchester, Sheffield & Lincolnshire Railway) : 

 Rugby to Catesby.' By Beeby Thompson, Esq., F.G.S., F.C.S. 



In this paper the portion of the line, 10 miles in length, from 

 Catesby to Rugby is described ; as the ground falls while the strata 

 rise in this direction, quite low beds in the Lower Lias are met 

 with near Rugby. The lowest zone exposed is that of Ammonites 

 semicostatus, in the lower part of which, and in Boulder Clay derived 

 from it, A. Turneri has been found. The next succeeding zone, that 

 of A. ohtusus, although for the most part barren, yielded the charac- 

 teristic fossils at its base. The o.vynotus-zone is well developed and 

 well displayed, besides being richly fossiliferous. The zone of 

 A. raricostatus merges into that of A. oxynotus below and that of 

 A. armatus above, and is not more than 3 or 4 feet thick. The 

 annatus-zone, beds between that and the Jameso?ii-zoTie, and the 

 Jamesoni-zone itself follow ; the middle beds of the latter being 

 rich in Rhynchonella and A. pettus, the name of this ammonite is 

 attached to the zone bearing them. The Ibex-zone occurs east of 

 Flecknoe, covered by rocks yielding A. Eenleyi ; and the highest 

 beds of this cutting appear to belong to the capricornus-zone. 

 Lists of the characteristic fossils of each zone are given, followed 

 by a complete list of all those found in the Lower and Middle Lias 

 of the cuttings, with a statement of their distribution. 



The Glacial deposits are described under the following headings : — 

 Blue or local Boulder Clay, brown and grey contorted Boulder Clay, 

 Chalky Lower Boulder Clay, (Mid- Glacial) sands and gravels, and red 

 Upper Boulder Clay. 



The paper is accompanied by a measure 1 section along the 

 railway. 



3. ' On the Remains of Amia from Oligocene Strata in the Isle 

 of Wight.' By E. T. Newton, Esq., E.R.S,, F.G.S. 



December 7th.— W. Whitaker, B.A., F.R.S., President; 

 in the Chair. 



The following communication was read : — 



1. 'The Geological Structure of the Southern Malverns and 

 of the adjacent District to the West.' By Prof. T. T. Groom, 

 M.A., D.Sc, F.G.S. 



The Raggedstone and Midsummer Hills, consisting ess3ntially of 

 massive gneissic and schistose rocks, are traversed by a curved 

 depression which marks a line of profound dislocation, probably of 

 the nature of a thrust-plane. This appears to dip towards the east, 

 though with a relatively small hade. Along this depression occur 

 strips of Cambrian and Silurian strata embedded in the Archaean 

 massif, and indicating the presence of a deep and narrow dis- 

 located synclinal fold. In places, the foliation of the schists 



