96 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 17, 



feet. 



Upper Lias f Shale with nodules 60 to 80 



Shales, -l Jet-rock — shale with jet and pyrites 20 



200 feet. [ Hard sandy shale 20 to 40 



"■ Ironstone-band, or ironstone - rock, with irregular 

 Ironstone partings of shale. (Avicula cygnipes, Pecten eequi- 



and valvis) 15 to 25 



Marlstone < Shales and ironstone-bands 50 to 70 



Series, Sandstone and shale, with Ophiuridce, Cardium trun- 



150 feet. catum, and many other fossils 40 



. Sandstone and shale 30 



Lower Lias Shale below. 



The details of the great ironstone-bands above the marlstone 

 appear in the following section, measured from the workings at 

 Eston Nab*, and communicated to me by Mr. John Murley, C.E. 

 These beds yield about 50,000 tons to the acre. 



ft. in. ft. in. ft. in. 



Ironstone: top block left as roof 11 ^ 



(parting) i 



Ironstone: second block 2 3 



(parting) Vl7 



Ironstone: main block 12 j 



(parting) 



Ironstone: bottom block (variable) 1 10 J 



Shale 7 0] 



Ironstone-band 1 8 I., fi 



Shale 6 0( 10 ° 



Ironstone-band. 10 J 



At Grosmont, near Whitby, the same series stands in this altered 

 and divided state, with about 8 feet of ironstone, yielding about 

 20,000 tons to the acre. 



ft. in. 



Shale 



Ironstone, " Pecten-se&m " in two bands, separated by 



1 ft. 6 in. of shale 4 



Shale 4 



Ironstone : good 1 



Shale 7 



Ironstone : good 1 6 



Shale 18 



Ironstone: " dvicida-seam" 4 



>32 6 



38 6 



At Feliskirk, in the vicinity of Thirsk, a trial- bore was made, by 

 my advice, through the upper lias, to the ironstone and marlstone, 

 with the following result. The upper bed mentioned is the In- 

 ferior Oolite capping the Lias, as at Thirsk, here verv ferruginous 

 (see Section No. 5, PI. VI.): — 



ft. in. 



The oolitic iron-rock of Mount St. John 6 to 7 



Shale, in the upper part cement stones 116 



* An analysis of the Cleveland iron-ore from Eston is given in Mr. Dick's paper, 

 Quart. Journ. Geol. Soc. vol. xii. p. 357. See also Mr. Crowder's papers, Edinb. 

 New Phil. Journ. New Ser. vol. iii. p. 286, and vol. iv. p. 49. 



