144 Epwarp Huri—The Relations of the Carboniferous, Devonian, and Upper 
General Succession of the Carboniferous and Devonian Rocks. 
orth Devonshire. South of Ireland. 
( Harthy limestone with Posidonomya Carboniferous Limestone. 
Lower (Benn Quarry). 
Carboniferous, Barnstable Slates, . ; F . Lower Carboniferous Slate. 
Series. Pilton Beds, d J’ 
( Werrroodl Badly (Crenilze, zo), ; Coomhola grits and slates (with Cucullea, &c.). 
Upper. Upcot Flagstones, . ; ; . Kailtorcan Beds (with Anodonta Jukesii). 
Devonian. ; Pickwell Down Sandstone, . . Old Red Sandstone and Conglomerate. 
| ( Morthoe Slates, p ; ; -| 
Middle. 
Ilfracombe limestone group, . : 
Devonian. i 
| Hangman Grits (Martinhoe b eds), . f Strata absent over the area of Ireland. 
Lower ( Lynton Slates and limestones, . ) 
Devonian, 
and Upper } 
Silurian. {| 
J Foreland Grits (base invisible), . Glengariff Beds, passing down into Upper Silurian 
Beds. 
The above table representing the consecutive series of the North Devon rocks, 
as recognised by nearly all writers on the Geology of this part of the British Isles 
—such as the late Sir H. De la Beche, Sir R. Murchison, Mr. Etheridge, Professor 
Haughton, and Mr. Townshend Hall, and which from a personal examination I am 
able to confirm, shows a threefold division of the Devonian formations below the Car- 
boniferous beds of Barnstaple. As far back as 1855 Dr. Haughton recognised in 
the Pilton and Marwood beds with Cucullaa—the representatives of the Lower 
Carboniferous slate and Coomhola grit series of the south of Ireland,* and this view 
has been re-asserted by him more recently.— A similar view was adopted by the 
late Mr. Salter and Professor Jukes, so that we may feel satisfied of its correctness. 
But beyond this there is room for an additional step in the identification of the 
two sets of strata which, to my mind is equally satisfactory, namely, that of the 
Upcot Flagstones and Pickwell Down Sandstone with the Kiltorcan Beds and 
Old Red Sandstone and Conglomerate of the south of Ireland. A short description 
of the formations in descending order is all that will now be necessary, and the fol- 
lowing section (Fig 5.) will give a general view of the succession of the beds. 
Fig. 5.—Section through North Devon from North Foreland to Barnstaple, showing 
the succession of the Devoman, Old Red Sandstone, and Carboniferous Beds. 
N Foreland, R. Lynn. Pickwell Down. High Bray. Barnstaple. 
1 oe 2 3. 4, 5. 6. 7. 8. 9. 10. 
1. Foreland Grits, &e. 2. Lynton Beds. 38. Hangman Grits. 4. Ilfracombe Beds. 5. Morthoe Slates. 6. Pickwell Down 
Sandstone, and Upcot Flags. 7. Marwood and Baggy Beds. 8. Pilton Beds. 9. Barnstaple Slates. 10. Carboniferous 
Limestone. * Fault between Foreland and Lynton Beds. 
Norr.—According to the measurements made by Rev. Dr. Haughton, the thickness of the Devonian beds amounts 
to 9,600 feet (Journ. R. Geol. Soe. Vol. V., p. 126). 
* Journ. Geol. Soc., Dub. Vol. VI., p. 227, é&e. 
t Journ. Roy. Dub. Soc. Vol. II. New Series, p. 126. 
