92 Reports and Proceedings — 



that Girvanella is not confined to Silurian rocks, and that as a rock- 

 forming organism it is more important than was supposed, occurring 

 in the Gloucestershire Pea-grit, and also in the Coralline Oolite of 

 Weymouth. He now dealt more in detail with its occurrence (1) in 

 the Carboniferous Oolitic Limestone ; and (2) in the Jurassic Oolites. 



In the Carboniferous Limestone of the Avon valley, oolitic lime- 

 stone occurs on four horizons, in three of which the oolites rest on 

 dolomite. In none of these three cases are there signs of Girvanella. 

 From beds partly oolitic, and not resting on dolomite, he has been 

 aide to determine two new species. The oolite not associated with 

 dolomite is less crystalline, and the original structure is better 

 preserved. 



In referring to G. pisolitica, he discussed whether Girvanella is 

 most allied to the "Challenger" Foraminifer, Eyperammina vagans, 

 or to Syringammina fragilissima. Traces of the organism occur in 

 the Clypeus-grit, but none are quoted from the beds of the Great 

 Oolite, nor from the Portland Oolite. The author had already shown 

 that the pisolites in the Coralline Oolite of Weymouth were not 

 concretions, but forms of Girvanella. Excluding these, he showed 

 that the spherules are of four types, of which one is the ordinary 

 oolitic granule, while each of the others suggests the presence of 

 Girvanella. 



The characters of the genus, as seen under the microscope, were 

 indicated, and four new species were described. 



2. " On the Relation of the Westleton Beds or ' Pebbly Sands ' of 

 Suffolk to those of Norfolk, and on their extension inland, with some 

 observations on the Period of the final Elevation and Denudation of 

 the Weald and of the Thames Valley." Part II. By Prof. Joseph 

 Prestwich, M.A., D.C.L., F.E.S., F.G.S. 



The author having, in the first part of this paper, 1 discussed 

 the relationship of the Westleton Beds to the Crag Series and to 

 the Glacial Deposits, proceeded in the present contribution to con- 

 sider the extension of the Westleton Beds beyond the area of the 

 Crag, and described their range inland through Suffolk, East, West, 

 and South Essex, Middlesex, North and South Hertfordshire, South 

 Buckinghamshire, and North and South Berkshire, noticing their 

 relationship to the overlying Glacial beds, where these were de- 

 veloped, and the manner in which they reposed upon older deposits. 

 He gave an account of the heights of the vai'ious exposures above 

 Ordnance Datum, and mentioned the relative proportion of the 

 different constituents in various sections, thus showing that in their 

 southerly and westerly extension they differed both in composition 

 and in mode of distribution from the Glacial deposits. Distinction 

 was also made between the Westleton Beds and the Brentwood Beds. 



Attention was next directed to the occurrence of the Westleton 

 Series south of the Thames, in Kent, Surrey, and Hampshire, and 

 their possible extension into Somersetshire was inferred from the 

 character of the deposits on Kingsdown and near Clevedon. 



In tracing the deposits from the east coast to the Berkshire 

 ] Proc. Geol. Soc. June 5, 1889. 



