12 GEOLOGICAL MEMOIES. 



coloured stripes and round spots strikingly resembling typical speci- 

 mens of the varigated sandstones of North Germany. This rests 

 again on alternating layers of yellow and dark-red sands and red 

 clay, followed by boulders of reddish-yellow sandstone. Every- 

 where the red clay appears beneath the shell-limestone, and may 

 be considered as a representative of the red " Werfen Slates" of the 

 Austrian Alps. Prom Jaworzno to Gistrowice, the way leads from 

 the Carboniferous sandstones, over the varigated sandstones and 

 their red clay, upwards to the sheU-limestone, and along a soft 

 northward slope to the dolomite. A boring sunk beyond the dolo- 

 mite led through about 60 feet of varigated clay, and beneath it 

 through nearly 100 feet of bluish-grey plastic clay with crystals of 

 gypsum. Among the fragments brought to light, silicified Spon- 

 garice and fragments of Belemites were found, so that this clay may be 

 considered as being a continuation of the Belemitic clay, interca- 

 lated between the oolites of the " Brown Jura" and the white 

 limestones with Ammonites hiplex. The " refractory clay," which 

 has become an article of export, is quite as different from the red 

 one as from the Belemitic clay. The strata sunk through in search 

 of this clay are in descending order : — 



feet. 



a. White Jurassic limestone 72 



h. Clay 30 



c. Compact quartzose sandstone 4| 



d. Clay (not refractory) 12-18 



e. White limestone in thin strata 36 



f. Compact high-yellow sandstone with coloured 



boulders of quartz, and occasionally with loose 



sand 18-24 



g. Bluish -grey clay (refractory) 2 



h. Loose gi'ey sands 12 



^. Grey loam 6 



h. Dolomite with Cadmia — 



The organic remains, extracted by these borings, were those of the 

 " Brown Jura," probably from the yellow sandstone (/). As far as 

 facts are stated at present, the refractory clay {g) and the loose 

 sands Qi) may be considered as being a rudimentary remainder of 

 the Keuper, lately stated by Prof. Bomer to occur in Prussian 

 Silesia. [Count M.] 



