224 NOTE ON THE SOTJTH DTTKBAM SALT BOEINGS. 



4. Thin greyish beds, with layers of bluish or ash-coloured ft. in. 



marls fc . 6 



5. Soft, yellow, earthy limestone, like No. 2 1 



6. Many thin shattery beds, with marl partings ; porous or 



cellular. Colours — grey, yellowish grey, or brown, in 



cloudy spots or stripes 20 



At the top are some very thin beds resembling marl-slate. 



' ' At Knottingley, in the cut for the canal, the bottom earthy- 

 beds (No. 2 of the above section) are laid bare. Near the centre 

 of the system were some remarkable contortions (1. c, Plate 

 VII., f. 6). At this locality the top beds exhibit the junction 

 of the deposit to the 'Upper Bed Marl,' but the contortions of 

 the beds make the phenomena less instructive than might have 

 been anticipated. 



" The same deposit, with modifications in the thickness and 

 colour of the limestones, are seen near Tickhill and Askerne 

 village. Some of these beds contain a very large percentage of 

 jnesia." — See Geol. Trans., 2nd ser., Vol. III., pp. 101-106. 



"Upper Limestone" or Brotherton Beds, and "Lower Red Marl" 

 of Sedgwick and Kirhby. 



The Brotherton Beds are a series of thin, flaggy limestones, 

 usually hard and compact, and of a yellow or grey colour. The 

 surface-planes are generally a little apart, and are often coated 

 with red, green, or purple clays or marls ; bands of marls simi- 

 larly coloured are occasionally met with among the limestones. 



In certain localities some of the beds contain casts of Axinus 

 dubius and Myalina Hausmanni, together with some obscure 

 remains that seem referable to Algse = Chondrites virgatus.* 



The Lower Bed Marl and Gypsum immediately underlie the 

 preceding beds. They consist of beds of red variously coloured 

 marls with bands of gypsum, are apparently unfossiliferous, and 

 are rarely seen in section. 



" The Brotherton Beds are well exposed at Knottingley, 

 Womersley, Hexthorpe, Wad worth, and many other localities." 



* From the description given of this Alg» I am able to -identify it with specimens 

 observed in the Chemical Company's boring, near the Tees. 



