718 PROF, E. HULL ON THE DINGLE BEDS AND 
LY. Rearions oF THE UPPrR SILURIAN SERIES OF THE SOUTH-WEST OF 
IRELAND TO THOSE IN THE SILURIAN REGION oF ENGLAND. 
From what has been said, it will be observed that, along with the 
late Sir R. Griffith, I regard the great series represented in the Dingle 
promontory, from the “Sybil (Upper Llandovery) beds” to the 
highest of the ‘‘ Dingle beds,” as the equivalents of the whole Upper 
Silurian series of the typical Silurian region bordering the Severn 
and Wye. Owing to the occurrence of considerable beds of lime- 
stone and distinctive characters, both petrological and paleontolo- 
gical, the Upper Silurian series of England and Wales is divisible 
into well-marked stages, as established by Murchison ; such, how- 
ever, is not the casein the west of Ireland. This has been acknow- 
ledged by Sir R. Murchison himselfin reference to the district of West 
Mayo and Galway, and is not less true in reference to the districts 
of Dingle and Kerry. The remarkable statement by the late Prof. 
Jukes which I have already referred to, may be regarded as con- 
clusive* on this head; he states that “the Sybil-Head beds, the 
Smerwick beds, and the Dingle beds are all purple slates and con- 
glomerates of exactly similar general characters, so that it would be 
impossible to distinguish them.” This statement, taken from his 
notebook as a general conclusion after an examination of the whole 
section from bottom to top, completely confirms the view I have been 
advocating in this paper. If we compare the sections in the $.W. 
of Ireland with those in the typical Silurian region, we shall find 
the representative strata somewhat as follows :— 
Upper Silurian Series of England and Ireland. 
England (Severn and Wye District). Ireland (Kerry). 
ft. 
Ludlow beds and passage-beds ..........000. 150 | TiEvalloe eal Gl 
: Aymestry Limestone ......... AQ) ea abe eanaty Cols eres 
OMG Aue Gh alen Nea cena ae case eee 709} riff Grits, 10,000 feet. 
Wenlock Limestone ............ 280 | 
Wenlock | Wenlock Shale ...... Ne 
beds. Denbighshire Grits j “7°” Poe 
Tarannon Shale .........s..00. 1500 y MISHA s Cove and Smer- 
wick beds. 
Upper U . 
pper Llandovery lime- 
Pe ! stone and sandstone...... 1000 
Upper Silurian beds ............sceeceee 6670 
From the above comparisons it will be observed that there is a 
large accession of materials in the upper portion of the series in the 
south of Ireland as compared with the representative beds in the 
south of England and borders of Wales. In both regions the Upper 
** This statement was only discovered by Mr. O’Kelly (Oct. 19, 1878) in one 
of Prof. Jukes’s notebooks, dated May 31, 1858, after the above paper was 
almost written, and is accompanied by a sketch and section intended as “a key 
to the whole promontory,” by which he shows that the fossiliferous Ferriter’s 
Cove beds are in part repeated in the Smerwick beds, owing to an inversion. 
