294 



THE GEOLOGIST. 



at present goes, the faunse of the^e three localities may be considered 

 as nearly, if not completely identical. 



Puditz and Pausnitz also, separated only by a distance of three 

 Austrian (between fourteen and fifteen English ) miles, possess in com- 

 mon only two species of Gasteropods. Puditz is one of the highest 

 fossiliferous localities in the Vienna basin, lying about 1400 feet above 

 the level of the Adriatic. Leitha limestone and the sandstones con- 

 nected with it, appear only as isolated but well-characterized hills, 

 rising above the surrounding plain. 



Four subdivisions may be distinguished within the diluvium of the 

 region herein question : — 1st, Erratic blocks and boulders ; 2nd, In- 

 ferior loam (Loss) ; 3rd, Terraced detritus ; and 4th, Upper or valley 

 loam (Loss). 



PROCEEDINGS OF GEOLOGICAL SOCIETIES. 



Geological Society oe London. — April 24, 1861. 



1. "On the 'Symon Fault' in the Coalbrook Dale Coal-field." By Marcus 

 W. T. Scott, Esq., F.G.S. 



This communication was based on observations made during many years on 

 a section through a part of the Shropshire Coal-field in nearly a straight line 

 from north to south, commencing at the Greyhound Pit, near Oakengates 

 Tunnel of the Shrewsbury and Birmingham Railway, and terminating at John 

 Anstice and Co.'s Halesfield Pits near Madely. Particular reference was made 

 to the explanation of the nature of the Great East or Symon Fault. The 

 author commenced making his observations on the Malinslee and Stirchlee 

 Royalties in 1843 ; and in 1845 he came to the conclusion that what the miners 

 termed in this locality the " Symon Fault," that is the successive dying out of 

 certain coal-seams, ironstones, &c, at various depths underground, was due to 

 an old denudation which had produced an inclined surface at the expense of 

 some of the beds before the upper measures were deposited. Having obtained, 

 in course of time, correct sections of several pits situated in the N. — S. line 

 above mentioned, the author, taking the "Little Flint" (the lowest workable 

 coal) as a base-line, plotted the several shifted segments of the coal-field in a 

 vertical plan, and thus restored the original outline of the denuded area (one 

 side of a valley) as seen in a transverse section. Six sinkings in the N. — S. 

 line having indicated the successive disappearance of five workable coal-beds 

 in a distance of 2484 yards, a seventh pit, 2000 yards further south, was found 

 to yield all the coals again, and the author thinks that between the sixth (the 

 Grange) and the seventh (Halesfield) pit the coals re-occur successively on the 

 opposite side of the old valley of denudation, and that they may here be sought 

 for and worked advantageously. The line of the old valley of denudation 

 apparently strikes the Great East fault, as laid down on the Geological Survey 

 Map, at a considerable angle. 



2. " On the Occurrence of Cyrena fluminalis associated with Marine Shells 

 in Sand and Gravel above the Boulder-clay at Kelsey Hill near HuLY' By 

 Joseph Prestwich, Esq., F.H.S., Treas. G. S., &c. 



The author's observations tended to show that the Cyrena flu minaVis, instead 

 of being limited, in its occurrence, to beds beneath the Boulder-clay (under 

 which circumstance it is found in Norfolk), occurs in deposits of newer date; 

 and that the argument, that the well-known beds at Grays, in Essex, are older 

 than the Boulder-clay, depending much on the presence of this shell, would 



