DAKYNS : LOWER CARBONIFEROUS ROCKS IN YORKSHIRE. 
359 
of the Yoredale Beds, is that which we call the Simonstoiie, and 
which Phillip's called the Simonside Limestone. It is about 16 
yards thick near Kettlewell. It is overlaid by plate, and the plate 
by a thick limestone, Phillips' Middle Limestone, which is about 32 
yards thick near Kettlewell. Over the Middle Limestone there 
comes in the Providence mine a series of alternating beds of plate 
and limestone, upwards of 36 yards thick. There is no recognisable 
bed answering to the Underset or Main Limestomc- ; but these impor- 
tant beds soon make their appearance as we go north. 
Tlie Main or Coverhead Limestone begins to put in a respectable 
appearance at Caseker, and soon swells out to an important rock, 
forming a plateau at the head of Coverdale with a fine escarpment 
towards Wharfedale. It is immediately overlaid by the Bearing 
grit ; but northwards a set of clierty beds comes in between the 
pure limestone and the grit ; at first, as at Coverhead, this is merely 
a thin chert top to the limestone, but this gradually develops into a 
series of cherty beds, sandstones, and shales, known as the Swaledale 
Black and Red Beds, and further north as the Coal Sills. 
East of the Wharfe the Millstone Grit Series generally consists 
of the following members : — 
Shale. 
Sandstone. 
Shale. 
Sandstone, 
Shale. 
The Brimliam Grits. 
Shale. 
The Shell Beds. 
Shale. 
The Upper Grit of Follifoot Ridge. 
Shale. 
The Lower Grit of Follifoot Ridge. 
Shale. 
A Thin Limestone. 
Kinderscout Grit in several beds. 
Pendle Grits, thin away north, or so coalesce with the beds 
above as to be inseparable from them. 
