128 
GENERAL SUCCESSION OF THE STRATIFIED ROCKS 
OF CUMBERLAND AND WESTMORLAND, WITH ESPECIAL REFERENCE 
TO THE LIMESTONES. 
? Cretaceous Rocks in maritime North-West Cumberland. 
Remains of the Jurassic Rocks (Lias Limestones at Great 
Orton. 
Upper New Red, with their magnesian limestones at Stanwix. 
Magnesian Limestone and Plant Beds. 
Lower New Red. 
Coal Measures, with their impure limestones. 
Millstone Grit, with their impure limestones. 
Yoredale Rocks, very persistent and important limestones. 
Mountain Limestone, thinning to the north-west, passing into 
the Calciferous Sandstone Series to the N. and the NE. 
Lower Limestone Shale, and cornstones. 
Upper Old Red Series, and cornstones. 
? Middle Old Red, with their limestones [may be concealed on 
the E.] 
Silurian Rocks, with calcareous nodules, &c. 
Ordovician Rocks, with the Coniston Limestone Series at the 
top, and the Helton Moor Limestones, 2000 feet down. 
Below these come the Borradale Volcanic Rocks, the 
Ingleton Green Slate Series, the Milburn Rocks, and 
then in part :— 
Cambrian, the Skidda Slates. 
Reviewing next the limestones of the district in chronological 
order, the lecturer began by describing those of Bala age. Two 
sets of these, occupying different geological horizons, occur 
within the district. Of these two the older (and least known) is 
found in the form of thin argillaceous bands in calcareous shale, on 
the fell-side slopes S.W. of Roman Fell summit, rather more than 
a mile to the S.E. of Helton, near Appleby. Here occurs a most 
important set of beds, which contain a considerable number of 
Ordovician fossils of Lower Bala types.* These beds dip towards 
* See Woodward's Geology of England and Wales, 2nd Edition, p. and 
Proc, Geol, Assoc., vol. Xi, p. Xvi. 
