internal Structure of the Magnesian Limesione. 113 



4. Yellow slaty limestone ^%'- ^"^'"^^'*- 



5. Limestone in thin blue beds i ^^ 



4 () 



6. Yellow clay q ^ 



7. Blue metal q „ 



8. Yellow, indurated sand, with much water go \q 



9. Yellow and grey post g g 



10. Blue metal 2g q 



11. Impure coal, &c. &c. The high main is about 66 fathoms below the! 



yellow sand, No. 8 7 - 4 



In this section the marl-slate is represented by Nos. 4. 5. & 6. No. 8. is the common form of 

 the lower red sandstone in this county. 



3. Eppleton Pit, about three-quarters of a mile N.E. of the old Hetton Pit. 



Feet. Inches. 



1. Soil and clay 24 



2. Limestone like Nos. 3. 4. & 5. of the previous section 54 o 



3. Soft, half-indurated yellow sand, lower part quick and full of water .... 126 



4. Grey metal, &c. &c. The high main expected at about 80 fathoms . . . 



The quick sand contains hard concretionary portions cemented with carbonate of lime. 



No. 6. — Section derived from the borings near Nunstainton*. 



Feet. 



1. Alluvial matter, principally strong clay, about 40 



2. Coarse, cellular, yellow limestone, (part of it described as approaching the") 



conglomerate form) . o J 



3. Thin-bedded, hard, and compact limestone go 



4. Various beds chiefly composed of shale, containing some thin beds of a red 1 



claystone j 



5. Coal, a good workable bed 



This section is remarkable from its locality, being derived from a place two or three miles 

 within the escarpment of the limestone. The greatest part of No. 3. (and perhaps also a part of 

 No. 4.) represents the compact limestone and marl-slate. As the lower sand is not mentioned, it 

 is probably either absent or represented in an obscure form, as in the Hetton section. 



I think it unnecessary to accumulate any more details respecting the trans- 

 verse sections through the other parts of the deposits described in the pre- 

 ceding chapter. There are^ however^ one or two places where the order has 

 been interrupted by great faults and dislocations, which require a short notice. 



Great faults or dislocations, ^c. — The most southern of these, which seems 

 to require notice, traverses the upper part of the series a few miles to the 

 south of Doncaster, ranging from the banks of the Don down the valley which 

 separates Wadworth from Loversall. It has produced a great upcast to the 

 N.E., in consequence of which the lower gypseous marls are repeated, as is 

 proved by the wells sunk through the upper limestone at Loversall. On the 

 south side of the valley near Wadworth, the broken edges of the limestone 

 beds are much contorted f. 



* See p. 60, note. t See Plate IV. No. 4. and Section 1, 



VOL. III. SECOND SERIES. Q 



