360 
HUGHES : INGLEBOROUGH. 
It may be convenient to give here a tentative correlation 
of the more conspicuous sub-divisions of the Silurian rocks of 
Ingleborough, with those of the adjoining area of Sedbergh and 
the Lake District, and with those of North Wales ; that is to say, 
with some of the characteristic sections of the ''* Northern Type " 
as described above. The Southern Type " will be referred to 
where it throws light on special points : — 
Ingleborough. 
Adjoining District. 
North Wale.s. 
Basement Beds of (Carbon- 
iferous. Unconformity. 
Basement Beds of Carbon- 
iferous. Unconformity. 
Basement Beds of Carbon- 
iferous. Unconformity. 
Grits of Rough Lands 
Studfold Sandstone. 
Hortoii Flags. 
An st wick Grit. 
Austwiok Flags. 
Pale Slates (and red 
shale). 
Graptolithic Mudstone. 
(with Spengill Lime- 
stone and Zone of 
Phacops elegans). 
Conglomerate or Cal- 
careous Grit. 
Kirkby Moor Flags. 
Kendal Beds. 
Bannisdale Slates. 
Firbank Limestones. 
Tebav Mudstones. 
How' Gill Beds. 
Aoidaspis Zone. 
Winder Grit. 
Helm Knot Sandstone. 
Upper Coniston Flags. 
Middle Coniston I'lags. 
Lower Coniston Flags. 
Pale Slates. 
Graptolithic Mudstone. 
(with Spengill Lime- 
stone). 
Paste Rock or Con- 
glomerate. 
Sandstones. 
Llansannan Shales. 
Grove Mudstones. 
Bodfari Beds. 
Acidaspis Zone. 
]Moelfammau 
Sandstone. 
Nantglyn Flags. 
Caer Drewyn Grit. 
Penyglog Flags. 
Pale Slates. 
Graptolithic 
Mudstones. 
Conglomerate Calcare- 
ous Grit or Pisolitic 
Limestone. 
Basement Bed of Silurian. 
On some part of the upper Bala Beds there is generally a 
thin conglomerate, represented sometimes by only a few pebbles 
occurring here and there, or it may be in the place of the con- 
glomerate a banded rock more or less gritty or more or less 
felspathic, but containing some material not derived from the 
immediately underlying series. It is often rich in fossils, and 
the lenticular fossiliferous bands indicate the incoming of forms 
of life over an area where they have not been similarly associated 
