﻿168 Geological Society : — 



March 7th.— Sir Archibald Geikie, D.C.L., Sc.D., SeclLS., 

 President, in the Chair. 



The following communications were read : — 



1. ' On the Occurrence of Limestone of the Lower Carboniferous 

 Series in the Cannock-Chase Portion of the South-Staffordshire Coal- 

 field/ By George Marmaduke Coekin, F.G.S. 



Silurian limestone underlies the Coal-Measures in the southern 

 part of the South-Staffordshire Coalfield, and a rock, probably 

 similar, was found in a borehole at No. 2 Cannock-Chase Colliery. 

 A shaft was sunk some 30 years ago, about 5 miles north of the 

 latter locality, at No. 1 Fair Oak, but was abandoned, as no work- 

 able coal-seam was found. Before the undertaking was abandoned, 

 an exploration-heading was driven for 44 yards in the direction of 

 the dip, and from it heads along the strike for 150 yards. In the 

 waste-heaps, which have remained undisturbed since 1875, a 

 number of fossils belonging to the Lower Carboniferous Limestone 

 have been found. A fault must be presumed to bring Carboniferous 

 Limestone into such a position as to be reached by the headings. 

 About 1^ miles north-west of Fair Oak, rocks (determined by 

 Mr. Walcot Gibson as Millstone Grit) were reached by a boring at 

 396 yards. An account of the strata pierced by the Fair-Oak boring 

 is appended. 



2. ' Liassic Dentaliidae.' By Linsdall Richardson, F.G.S. 



March 21st. — Aubrey Strahan, M.A., F.R.S., Vice-President, 

 in the Chair. 



The following communications were read : — 



1. 'The Chalk and Drift in MoW By the Rev. Edwin Hill, 

 M.A., F.G.S. 



In 1899 Prof. Bonney and the writer published a paper on 

 Moen and Biigen : the present contribution contains results of 

 further studies. 



The problem of Mben is to account for portions of Drift, isolated, 

 and seemingly included, in cliffs of Chalk. It has been generally 

 assumed that these portions occupy dislocations, and that the disloca- 

 tions were either simultaneous with, or subsequent to, the deposition 

 of the Drift. But, in this paper, cases are described where Drift is 

 seen to occupy cavities in dislocations, which had been waterworn, 

 and consequently had been produced, before the advent of the Drift. 

 The assumption hitherto generally made is, therefore, incorrect : 

 the Chalk had been disturbed in pre-Glacial times. A probable 

 assumption that there were pre-Glacial hills and cliffs similar to 



