icl. 



Th 



COALS AND SANDSTONE. 



e 



57 



v 



was 



"fcich we, 



the 



work 



lie disi 



j, 



to mak e . which it flies to pieces when placed upon the fire. It 

 ere ctej * s a bituminous substance, and is said to have been formed 



from decomposing vegetable matter in water, in the finest 

 state of division. It differs from the purer kinds of ordi- 

 nary coal and jet, from its containing extraneous earthy 

 impurities, which render it specifically heavier than water, 

 jet, on the contrary, being lighter. It is hard enough to take 

 a fine polish, and is made into inkstands, snuffboxes, beads, 

 and other articles. — H. W. B. 



162, 162a — Permian coal, with a laminated structure, 

 and circular concentric concretionary markings Bullock's 



, South 

 See Juke's " Memoir on South Staffordshire 



UPPEB 



Galleey. 

 Wall-case 41. 



Which 



he shale, fon 

 nina and! 

 »anure, and Farm PitSf near Spon Lane ^ rf est B 



the growll 

 i the sizet 



Staffi 



Coal Field," pp. 159, 160 ; also map 62, and vertical sec- 



ive been k tions, sheet 18, No. 25. 



the Isle off 



i 



The specimens Nos. 162 and 162« were taken from a bed of 

 - been calk true Permian coal, 10 inches thick, resting on 3 feet 8 inches 

 been d of fire-clay, " Part of the 10-inch coal is shaly and rotten, 



but about two inches of it is a beautifully bright coal, 

 black ban highly bituminous, very brittle, with curious circular con- 



• . • mm .. . _ . 



i re, 



formw? 



-hire. 



« Bj 



centric concretionary markings." (See 162a.) 



163.— Anthracite coal, from Coalbroohe, between 

 o'mnionly V; Shannon and Llangyndyrn, Caermarthenshire. Anthracite 



In general it contains 



ins, &* 



layers^ 

 » Jukes fl» 



n p . 161.) 

 'rted M 



I 



from 80 to 95 per cent, of carbon, with 4 to 7 per cent, of 

 water and a variable proportion of earthy matter. It is 

 difficult to ignite, but, when ignited, it burns without flame 

 or smoke, and gives out intense heat, leaving very little 

 residue in the shape of ashes. — H. W. B. 



i ylet 



;ll!'< 



164. 



B 



from Pont 



or Coal 



165. — Coal, with a peculiar structure, locally termed 

 "crystalline, or cone-in-cone."— Merthyr Tydfil, Glamor- 

 ganshire. Presented by W. Crawshay. 



166— Slightly argillaceous sandstone, interstratified 

 with coal, from Baremoor Pit, South Staffordshire. In the 



Baremoor pit, a large oval cake of sandstone 286 yards 



L 



