222 NOTE ON THE SOUTH DURHAM SALT BOEINGS. 



correct, as I think it is, and seems to be proved, that the Salt 

 below this Limestone is of Permian age, and would be so con- 

 sidered by every one acquainted with the German Permians. 



It may be mentioned here that Rock Salt is found in Ger- 

 many in the Middle Zechstein as well as in the Upper, in the 

 Bunter, and also in connection with the Muschelkalk, "Wellen- 

 kalk, and even in the Keuper. 



"We will now compare the lower portion of Messrs. Bell Bro- 

 thers' section, as recorded in Mr. Wilson's paper, with one from 

 Karsten's " Salinenkunde " and Dr. Geinitz' "Dyas," and with 

 sections of the Upper Magnesian Limestone and Red Marl of 

 South Yorkshire, by Prof. Sedgwick and Mr. Kirkby. 



Saltholme Trial Bore. 



Beginning with one or two beds above the Limestone we have, 



ft. 



Rock salt, marl, and gypsum 35^ ^ 



Shale, very soft, and gypsum 8 > g 



Gypsum (I take this to be the lowest bed of the Trias) 13 _) 



Gypsum and limestone , 12 "\J> 



Limestone (with much gas) 45 



Grey limestone 9 



Grey limestone and gypsum 11 J £ 



Gypsum 2 \ w 



Gypsum containing salt 1 



Rock salt 14 



Marl containing salt 2 I tj 



Marl and gypsum 1 | " 



Impure salt 1 



Borehole near Gera, from Karsten's "Salinenkunde," (p. 286) and 

 Geinitz' "Dyas," (p. 234). 



ft. in. 



Bunter ( 7 4 rothe Letten. 



Sandstein. ( 73 8 Bunte Schieferletten. 



45 7 Oberer Zechstein = Plattendolomit. 



24 9 blauer Thon und Gyps. 



Zechstein 1 119 2 Gyps nnd Thon. 



formation, j 8 6 fester, Schwarzlicher Gyps. 



10 3 lichtblauer Thon mit Gyps. 



28 2 Steinsalz. 



317 5 



2 S 





