Vol. 62.] AN TJNCONFOBMITY IN THE COAL-MEASUKES. 533 



The beds referred to in this paper are the following : — 



Upper Series. 



Feet. 



The 'Table-Rocks' Sandstone 30 + 



Unconformity. 



Lower Series. 



Shales 12+ 



Mussel-Band about 1 



Shale 3 



Sandstone 8 



Shale 8 



Sandstone 10 to 12 



Shales, etc — 



II. Description of the Phenomena. 



We will now briefly describe the more noteworthy facts 

 observable in following the unconformity from south to north, 

 taking each point as it comes. 



From A (see sketch-map, fig. 1, p. 532), where the junction of the 

 two series emerges from the sea, to B, there is no discordance of dip, 

 and no disturbance in either : nothing, in fact, to draw the attention 

 to any break in the succession. A thin shale, merely, separates the 

 Mussel-Band from the Table-Bocks Sandstone. The actual junction 

 is buried under shore-deposits. 



At B, the base of the Upper (Table-Bocks) Sandstone is suddenly 

 raised to accommodate a small faulted and denuded portion of 

 lower beds. This disturbed space, 6 to 7 feet in length, 

 includes a high dip of the Mussel-Band and a reversed fault of small 

 throw, hading to the south-east, as shown in fig. 2, below. 



Fig. 2. — Section B ; length of section = 6 feet. 

 S.E. N.W. 



BEACH- 

 LEVEL 



[The vertical scale is the same as the horizontal.] 

 T.E.S. = Table-Eocks Sandstone ; the Mussel-Band is shown in black. 



A few yards farther on, the line of unconformity again rises above 

 the beach-level, and another and longer islet of shale (beneath the 

 horizon of the Mussel-Band) is well shown. The junction here is 

 of especial interest, as the Table-Kocks Sandstone at its very base is 



