284 Reports & Proceedings — Geological Society of London. 



and the general effect is comparable with that of igneous intermixtures 

 described from County Down and Skye. In the Galway instance, 

 however, there is no sign of general fusion of the invaded rock, 

 which retains its original foliation and controls the structure of the 

 composite mass. 



2. " Further Work on the Igneous Rocks associated with the 

 Carboniferous Limestone of the Bristol District." By Sidney Hugh 

 Reynolds, M.A., Sc.D., F.G.S., Professor of Geology in the University 

 of Bristol. 



The paper gives an account of the additional information, con- 

 cerning the Carboniferous volcanic rocks of North Somerset, which 

 has become available largely through digging trial-holes, since the 

 publication in the Q.J.G.S. for 1904 (vol. lx) of a paper by Professor 

 Lloyd Morgan and the author on the subject. The rocks occur at 

 five localities : (1) Goblin Combe ; (2) Uphill ; (3) Limeridge Wood, 

 Tickenham ; (4) Spring Cove and Milton Hill, Weston-super-Mare ; 

 and (5) Woodspring or Middle Hope. 



At Goblin Combe, as the result of digging nearly forty trial-holes, 

 it was ascertained that the igneous rocks form two discontinuous, 

 somewhat crescentic masses, each consisting of olivine-basalt overlain 

 by a considerable thickness of calcareous tuff. At Uphill the evidence 

 obtained was insufficient to determine whether the basalt is a sill or 

 a lava-flow. At Limeridge Wood, Tickenham, where only debris of 

 basalt had previously been recorded, the presence of an oval mass 

 measuring about 60 by 25 yards was proved by digging trial-holes, 

 and the fact that it is completely surrounded by limestone indicates 

 its intrusive character. Several additional exposures are described 

 on Milton Hill, where the lava forms a band about 150 feet thick. 

 The lava at Middle Hope or Woodspring is shown to form an irregular 

 and discontinuous mass. 



Previous statements as to the essentially basaltic character of these 

 rocks are confirmed. Olivine is present at each locality. Analyses, 

 mainly made by Mr. E. G. Radley, show that in some of the rocks 

 a high percentage of potash is present. 



3. May 12, 1915.— Dr. A. Smith Woodward, F.R.S., President, 

 in the Chair. 



The following communication was read : — 



" On Parka decipiens, Fleming." Bv George Hickling, D.Sc.,F.G.S., 

 and Archibald W. R. Don, B.A., F.G.S. 



The paper is a joint statement of originally independent investiga- 

 tions of this Old Red Sandstone organism. The views of Fleming, 

 Hugh Miller, Man tell, Lyell, Powrie, Page, and others are quoted to 

 illustrate the chequered career of this enigmatical fossil in geological 

 literature. To Dawson and Penhallow, supported by Reid and 

 MacNair, belongs the credit of making the first serious attempt to 

 obtain definite evidence as to its nature and of establishing its 

 vegetable character. The present account is based on the observation 

 of great numbers of specimens in the field, and on the microscopic 



