— =P 
TRANSACTIONS OF THE SECTIONS, 89 
Nerbudda to the Ganges at Monghyr. These appeared to be of prior date, and there 
was a probability that there was a great line, or a group of lines, of dislocation pass- 
ing along the general line of the valley of the Nerbudda, and the effects of which 
might be traced over a very large area, extending towards the north-east, possibly 
even into the Valley of Assam. Besides the examination of these districts, which 
together included an area of more than 30,000 square miles, the Geological Survey had 
been able to add to the knowledge of the structure of the country in other ways. 1, An 
excellent selection of fossils from the neighbourhood of Verdachellum in Madras, for 
which they were indebted to Brooke Cunliffe, Esq., who had been associated with the 
Rev. Mr. Cay in the first examination of these fossils, had enabled them to add largely 
to the lists of Forbes, and to establish more conclusively than before the cretaceous 
age of these deposits. 2. ‘he exertions of Captain Keatinge at Mundlaiser, to whom 
Mr. Oldham had pointed out the interest of the inquiry, had collected a good set of 
organic remains from the limestone at Bang, to the west of Mhow, which had enabled 
him to fix the age of those deposits as contemporary, or nearly so, with the cretaceous 
beds of Trichinopoly and Verdachellum. ‘This discovery gives rise to many import- 
ant speculations as to the age of other beds, and also as to the epoch of the elevation 
of all Central India; but more data were required before these could fairly be entered 
upon. 
On the Ironstones in the Oolitic District of Yorkshire. By Joun Puitutes, 
MA. LL.D., F.R.S., Reader in Geology in the University of Oxford. 
On the Discovery of Paradoxides in New England. 
By Professor W. B, Rocers. — 
On the Geological Survey of Pennsylvania. By Professor H. D. Rocsrs. 
On the Fossils of the Dingle District. By J. W. Sauter, F.G.S. 
In this communication the author gives the detailed succession of beds in a section 
from Sibyl’s Head on the north to Dunquin and Machin Mountain on the south, and 
shows from the fossil succession, as had also been demonstrated by Mr. G. Du Noyer 
from sections, that,— 
1. There is no evidence of a great anticlinal arch, including the whole of the Silu- 
rian beds, nor of a double anticlinal divided by the mass of Clogher Head (there is 
however, a great flexure and fault at this point), but rather the underlying rocks, Silu- 
rian and Lower Devonian, taken in a rough sense, lie in a rude, faulled and broken 
synclinal, the lowest beds being respectively at Sibyl’s Head on the north, and at the 
Bull’s Head promontory east of Dingle, on the south. 
» 2. The Wenlock and Ludlow formations are present, each well-developed, and 
very much like those of Britain, with some differences in the distribution of the fos- 
sils. The Chonetes lata, for example, a characteristic Ludlow fossil in Britain, is 
here most abundant in the lower Wenlock beds. Many common trilobites and shells 
also occur in it. Great coral beds (chiefly Favosites polymorpha) distinguish the 
Wenlock series, with abundance of a large Spirifer, S. bijugosus, and of Aviculz pecu- 
liar to the district. 
Pentamerus Knightit, Rhynchonella navicula, with several species of corals, mark 
the upper or Ludlow series; and there is a mass of fucoid-bearing strata—very re- 
markable and persistent—between the Ludlow and Wenlock series. At Bull’s Head 
promontory, beds with Pentameri occur beneath Wenlock strata; and though these 
cannot be connected with the beds to the northward, there is reason to think them the 
equivalents of the beds at Sibyl’s Head (which underlie the old red conglomerates), 
and that they are here brought up by enormous faults. 
_ Lastly, attention is drawn to the fact, that this is the only Upper Silurian district of 
Ireland; that of Uggool, county Mayo, being rather the uppermost beds of the great 
‘Llandovery or May Hill sandstone series, so fully developed in Connemara. 
