136 Scientific Proceedings, Royal Dublin Society. 
When theplants were pronounced by Salter to be of Carboni- 
ferous types* Jukes considered the question to be finally 
settled. Griffith, however, said “ Wait untilthe Dingle district is 
examined and you will find that although the plants may be of 
Carboniferous types the rocks are Silurians.” 
When the Dingle peninsula was examined by Du Noyer, Foot, 
and Wynne, it was found that, while there was a great uncon- 
formability between the lower and upper divisions of the strata 
called Old Red Sandstone, a complete conformability extended 
from the lower division downwards into fossiliferous Silurians, 
and from the upper division, upwards, into the Carboniferous 
Limestone, and thence into the Coal Measures. In the Lower 
division, however, no fossilsf could be found ; and those strata 
were called “ Dingle Beds,” a title which involved no assumption 
as to their age. To this lower division according to both Griffith 
and Jukes, the first mentioned rocks near Killarney, near Val- 
encia, and in West Cork belong. 
Subsequently these rocks were examined by Griffith, Murchi- 
son and Jukes conjointly ; and some of the party visited not only 
Cork and Kerry but also Galway and Mayo. After this explo- 
ration Murchison was inclined to side with Griffith, notwith- 
standing the difficulty presented by the plant remains. 
But on the other hand, the late Mr. John Kelly showed that 
the Dingle Beds have the same stratigraphical position as the 
rocks mapped as Old Red Sandstone in the Curlew and Fintona 
mountains; while the latter are lithologically similar to the Old 
Red Sandstones of the Commeragh and Knockmealdown Moun- 
tains, and the Galtees. The classification of the just mentioned 
Cork and Kerry rocks was therefore left an open question, until 
the rocks in Mayo, Roscommon, Sligo, Fermanagh, and Tyrone, 
suggested by Griffith to be of the same age as the Dingle Beds, 
were examined. 
Jukes, as a believer in the “Old Red Sandstone” formation, 
could scarcely act otherwise ; for, as he said at the time, “If you 
make the Dingle Beds Silurian you do away with the Old Red 
Sandstone.” 
* Baily agrees in this opinion. 
+ I have since learned from Mr. O'Kelly that fossils like plant stems were subsequently 
found in the Dingle beds. 
