594 MR. R. D. VEENOlf ON THE GEOLOGT AND [DeC. I912, 



Measures was not continuous, but that, at certain periods, sedi- 

 mentation was interrupted by local elevation and contemporaneous 

 erosion. In the measures above the Thick Coal, local breccias are 

 not infrequent. These rocks consist of angular fragments of coal, 

 ironstone, or shale, often several inches long, set in a matrix of 

 coarse sandstone or of an extremely hard ganister-like sandstone. 

 Fragments of plants, and casts in shale or ironstone of Trigono- 

 carpus, as also large specimens of Carhonicola, may sometimes be 

 found in these coal-breccias. 



Extensive barren areas or ' wash-outs ' affect some of the 

 seams: especially the Ryder Coal at Kingsbury and Arley, and the 

 Thick Coal at Exhall Colliery. An example of a local uncon- 

 formity is seen in a clay-pit at Poles worth, where fireclays and 

 coal-smuts dip at an angle of about 25° under nearly horizontal 

 sandstones with a breccia at the base. A section of this clay-pit 

 is appended: — 



Thickness in feet, 

 ( Massive ferruginous sandstones, which form the 

 •pj. . - J whole of Hermitage Hill west of Polesworth. 



j At the base, ashy grit and a breccia of vein-quartz 



1^ and felspathic quartzite 1 



/^Fireclay with coal-smuts 8 



Dipping I Yellow sandstone 6 



at ■{ Fireclay and red mottled marl with sphserosiderite 10 



25°. 1 Coal-smuts 1 • n / 1 



[Fireclay | ^^^n m well | ^ 



Total 27 



The sandstones of Hermitage Hill are the Haunchwood Sand- 

 stones, while the beds in the clay-pit represent the uppermost 

 beds of the Productive Measures ; the unconformity thus appears 

 to be related to the apparent absence of the Nuneaton Clays at 

 this locality. 



Coal-seams. — In the following general sections the more im- 

 portant coal-seams in each half of the coalfield are arranged in 

 descending order, and a correlation of these seams is suggested : — ^ 



South. North. 



( Two- Yard Coal Four-Feet Coal. 



^tTp. • 1 1,- I Eyder Coal Kyder Coal. 



Warwickshire ^^^^.^(.^^1 Eare Coal. 



Thick Coal. I Ell Coal. 



^ Slate Coal Slate Coal. 



Seven- Feet Coal Seven-Feet Coal. 



Double Coal. 



Bench Coal. 



The Seven-Feet Coal appears to be the only seam which has been 

 recognized individually throughout the coalfield. The Double and 

 Bench Coals are not known in the extreme south of the coalfield ; 

 and in the extreme north, near Tamworth, it becomes impossible 

 to identify the Ryder, Bare, and Slate Coals. The measures above 



