;94 Reports and Proceedings — Geological Society of London. 



chief source of the Crustacea which hi^ve been quoted from the 

 Warminster Greensaud. Above the chert-beds, and below the 

 horizon at which Stauronema Carteri comes in, is a variable set of 

 beds which include a layer of concretions known as cornstones or 

 popple-stones. These beds are very rich in fossils, and include at 

 Maiden Bradley a layer of phosphatic nodules. They contain the 

 Eye Hill fauna of the Warminster Greensand, and it is proposed to 

 <3all them the zone of Ctdopygns columharius. In Southern Wiltshire 

 there is usually a complete passage from this zone into the Chloritic 

 Marl ; and as the cephalopoda of this zone are all Chalk Marl 

 species, the natural inference from the local evidence would be 

 to place the plane of separation between the Selbornian and 

 ■Cenomanian stages at the base of the G. columharius beds. In 

 Dorset, however, the break above these beds is so very marked and 

 strong that the authors think that the beds with the Eye Hill fauna 

 must be retained in the Selbornian. It is one of those cases in 

 which the palteontological and the stratigraphical breaks do not 

 coincide. 



lL_Jan. 9, 1901.— J. J. H. Teall, Esq., M.A., F.E.S., President, 

 in the Chair. The following communications were read : — 



1. " The Geology of South-Central Ceylon." By John Parkinson, 

 Esq., P.G.S. 



In this communication the author endeavours to give some account 

 of the relations between the various granulitic rocks of Ceylon. 

 A series of more or less isolated sections were studied, the rocks in 

 each considered under separate heads, and conclusions put forward 

 relative to the whole. Two sections are described to the west, and 

 one to the north, of Kandy, in which the rocks are of a well-marked 

 type. As a rule they are strongly, often coarsely, banded ; and the 

 relation of the light and dark bands is such as to leave the author to 

 conclude that this structure arose "through the streaking together of 

 the component parts of a magma which had undergone differentiation." 

 The darker parts are characterized by the presence of green horn- 

 blende in varying quantity, associated with brown mica. Locally 

 garnets are abundant, and pyroxene is found in some slides. A fourth 

 section, south of Matale, is of importance, since it is believed that 

 here a granulitic rock resembling some described under the section 

 which follows (Section V) is intrusive in a crystalline limestone. 

 Modifications in the intruder are described, which are supposed to 

 have arisen through the local incorporation of some of the older rock. 

 Under Section V rocks from Newara Eliya, Ohiya, and Bandarawella 

 are grouped together. These are often banded and vary considerably 

 in coarseness, but are distinguished, with few exceptions, by 

 a greenish colour accompanied by a greasy lustre, and usually by 

 the presence of garnet. Hornblende, magnetite, and biotite are 

 associated with this mineral, and a pleochroic augite is not uncommon. 

 The structure of all the rocks described is granulitic ; that is, 

 characterized by the irregularity in the outlines of the grains which 



I 



