490 TIDDEMAN : CARBONIFEROUS ROCKS IN UPPER AIRE-DALE. 
section of it with beds of reef cliavacter may be seen on the east 
side of tlie stream here. 
A little further south and on to Calton it is much contorted and 
also faulted. From this village eastwards it is much concealed 
by drift, but shows again with sections of great interest at the 
Winterburn Reservoir. Here we have black, well-bedded limestone 
surmounted by white reef limestone with little bedding, but the 
upper sloping surface of it as seen, or lately seen, in the dam of the 
puddle trench, consists of a close breccia of angular fragments of 
Hmestone. The Bowland Shales in Calfgill (or "Way gill, one-inch 
map) hard by, are full of beds containing fragments and pebbles of 
limestone, and even large detached boulders are found in them. These 
interesting sections will unfortunately be drowned in the waters of 
the Reservoir. 
To the East this limestone is only obscurely shown for some 
distance, but it swells out again into bigger dimensions at the great 
long knoll of Swinden, and on the other side of a peaty swamp, 
containing a trough of Bowland Shales, is conspicuous in a wonderful 
assemblage of knolls, bearing the names of Skelterton, Garden, 
Butterhaw, Stebden, Elbolton, and many others, running by Burnsall 
to the Wharfe. Elbolton and Stebden are extremely fine and 
conspicuous examples, Stebden in particular rising high towards the 
Grit Fells, and showing well the quaquaversal dip of its flanking 
beds. Skelterton appears rather to exhibit a section of the internal 
economy of a knoll, showing great stools of coral running in beds, 
the interspaces being filled up with crinoidal remains. 
As we trace these beds away on the south side of the anticline 
they lessen much in feature and thickness, so much so that we cannot 
follow them with certainty beyond Flashy. On the north side of the 
Skipton anticline, however, they come in on the same horizon, and 
may be traced for some miles, exhibiting in places a decidedly 
brecciated character. 
The well-known Draughton Limestone on the south side of that 
anticHne, so popular as an instance of a contorted limestone, is seen 
on weathered surfaces to be made up of breccia in some of its beds, 
a fact which I believe has hitherto escaped notice. This is well seen 
