HIN D : CAUBONIFEUOUS ROCKS OF THE PENNINE SYSTEM. 451 
mentioned above. Unfortunately this series was named Yoredale Series, 
as it was supposed to be the equivalent of the Yoredale Series of 
Wensleydale, but lithologically, stratigraphically, and paleontologi- 
cally, the two series are quite distinct and are on different horizons. 
The Pendleside Series occupies a very limited area. Its northern 
boundary being about a line from Greenhow Hill to Linton Mill, then 
passing west to a point a little south of Giggleswick, thence across 
the lower end of the Furness district to Poolvash, Isle of Man, and 
so on to Co. Meath, and across Ireland to Foynes Island, Co. Limerick. 
To the south we know the series is represented in Leicestershire 
by a few feet of shales, and is absent along the northern margin of 
the Coalbrookdale coalfield. The series appears to be represented 
in North Wales by the Holywell Shales. The deposit is thickest at 
Pendle Hill, and here the greater thickness seems due to a greater 
amount of shales below the Pendleside Limestone, and to the greater 
development of the limestones. This is a purely local thickening, and 
within a few miles north, south, and west of Pendle the deposit is 
much thinner, and the limestones so much reduced that the officers 
of the Survey did not think it worth while to map them, notwith- 
standing the constancy of the bed, even though it was attenuated, 
and the strong paleontological evidence contained in it. 
The characters of the limestones of the Pendleside Series are 
quite different from those of the real Yoredale Limestones, both in 
texture, chemical composition, and fossil contents. In our paper 
(of supra cit., pp. 394-401) one of our purposes was to show the 
petrological and chemical differences between the limestones of the 
Pendleside Series and those occurring in the dome-shaped hills of 
Cracoe-in-Craven, because for some, to us, unaccountable reason 
the latter had been correlated with the Pendleside Series, and there- 
fore actual details of the real Yoredale Limestones were not given at 
that time. It may be stated here that the Yoredale Limestones agree 
in characters with the various beds of the thick Massif Limestone. 
At the base of the series, a series of passage beds containing 
detrital shell material and fragments of limestone are found in places. 
At others shales seem to come on regularly on the top of the Lime- 
stone Massif, and elsewhere evidence seems to point to masses of 
