ON SEISMOLOGICAL INVESTIGATIONS. 93 



pai'ticularly iu connection with an increase in office accommodation. 

 Mr. Richard Cooke, The Croft, Detling, Maidstone, has kindly sent 

 \l. Li. as an annual subscription for the support of seismological research. 



II. 2^he Situation of Stations. 

 Continued from 'British Association Report,' 1905, p. 84. 



AchalaJci. 



The town lies on a plateau. Beneath the town we find two lava streams, the 

 lower one trachytic with a columnar structure, here dense and there porous. 

 Above this there is a dolomite schist, in parts solid and in others porous. These are 

 separated from one another by schistose sandstone of Miocene age with slate and 

 layers of coal. 



Batoum. 



The town lies in the Kachaber low ground, which is formed of the deposit of the 

 river Tschoroch. A vertical section through the low ground shows the following 

 horizontal strata in downward succession : — 



Humus 355 metre 



Hard clay 2-84 „ 



Clayey sand mixed with pebbles . . . 1'42 „ 



Sand 1065 „ 



The heights surrounding the town consist of different sorts of andesite and tufa. 



BorsJiom. 



The little town of Borshom lies in the valley of the river Kura, and its tributary 

 rivers Borshoraka and Tschornaja Retchka. 



The tectonic formation which is shown in the neighbourhood of Borshom may 

 be summarised as follows : Steep sloping strata of the Eocene period intermingled 

 with andesite strata form anticlinal and synclinal folds. The protruding ends of 

 strata consist of andesite lava in layers and streams. 



The sedimentary formation is represented by marl and argillaceous sandstone. 

 The marl possesses the peculiarity of being broken into small pieces ; the sandstone 

 is traversed by a system of perpendicular clefts inclining to a cubical cleavage. 



The region on the right side of the Kura forms a plateau which is an anticlinal ; 

 the middle of the plateau coincides with the ridge of the anticlinal, and strikes 

 N.W.-S.E. 



Upon the left side of the Kura, where the seismic station is situated, there is a 

 deposit of sandstone and marl in layers with a uniform dip of 15° N.E. 



Schemacha. 



The town lies partly on the slope of the valley of the river Dsoga-Lawa and partly 

 in the river valley itself. No account of the structure of the district has been published. 

 Many varieties of sedimentary rocks belonging to the Tertiary period are to be found. 



In the town towards the south, Muschelkalk schist supported by clay slate 

 dips N.W. 



On the southern face of the height which rises above the town one finds the same 

 limestones exposed, which in their higher part dip S.E., but in the lower part W.S W. 



In a deep ditch not far from the prison we find laminated plastic clays which 

 support intermediate layers of marl, sandy clay, and lime sandstone. 



To the south of the town, not far from the village Bojat, one finds the following 

 strata exposed in this order downwards : — 



(a) Yellow and brown coloured sandy clay. 



(J) Various layers of insignificant thickness of yellow and white clay3. 



(c) Shell limestone (Muschelkalk) with Cardium {sic) and Mactra. 



(d) White and yellow porous sandstone with shells. 



