NOTE ON THE SOUTH DTJEHAM SALT BOEINGS. 223 



Now let us compare this small section of the Upper Zechstein 

 of Germany with Sedgwick's sections of the "Lower Bed Marl 

 and Gypsum" and the "Upper thin -bedded Limestone" of the 

 South of Yorkshire. (Sections in the ascending order.) 



" Lower Red Marl and Gypsum." 



1. — Plaster-pit Hill, near Ferry Bridge. Thickness. 



— Beds of gypseous marl resting on yellow limestone not seen 



ft. in. 



— Blue, red, and variegated marl, with much fibrous gypsum 15 



— An irregular bed of red marl, with strings and nodules of 



gypsum 6 



— Hard, chocolate brown marl, with eight or ten thin beds 



of fibrous gypsum 18 



— Red and blue marl beds, contorted, and passing into dilu- 



vial covering 8 10 



2. — Section in Cut for the Canal below Knottingley. 



— Red marl and fibrous gypsum at bottom of section. Part 



visible about 6 



— Impure yellowish clay 1 



3. Yellow indurated marl 4 



4. Stiff blue clay 2 



5. Meagre calcareous yellow marl 1 



6. Impure earthy limestone 3 



Over these came the regular beds of the superior limestone. 



Quarries near Askerne. 



Thickness 



1. Unctuous, red marl and fibrous gypsum ; top part exposed not seen 



ft. in. 



2. Meagre blue and red clay 2 



3. Striped, red and yellow sandy beds 3 



4. Red marl, mixed with incoherent yellow sand 3 



5. Grey, impure, sandy limestone, with dendritic impressions 4 

 Over these came the regular beds of the Upper Limestone. 



These sections are in ascending order, and the two last represent the 

 highest part of the Lower Red Marl and Gypsum." 



" Upper thin-bedded Limestone." = (Plattendolomit. ) 



Brotherton, near Ferry Bridge, beginning with the lowest. 



1. Red marl and gypsum, with a few feet of blue clay above 



ft. in. 



2. Soft, yellow, earthy limestone 3 



3. Irregular bed or congeries of thin beds, imperfectly con- 



cretionary ; partly earthy, partly compact, etc 3 



