72 Geological Society : — The Rev. J. F. Blake on the 



Eskdale-granite pebbles ; and during his last or fourth visit to the 

 district, he found a large granite boulder on the axial summit of the 

 ridge, about 1450 feet above the sea, showing a submergeuce of the 

 mountain to at least that extent. He went on to assign reasons for 

 believing that the sea lingered longer at the level of the sand and 

 gravel knolls than lower down and higher up, so as to allow time 

 for the extra rounding of the pebbles, accumulation of erratics, 

 and multiplication of Mollusca ; for he could discover no reason 

 for supposing that the mollusks which left the shells did not live 

 on or near the spot in the littoral or sublittoral zone. He then 

 described a small exposure of high-level rounded gravel and sand 

 near Llangollen, and dwelt on the remarkable fact that the marine 

 deposits on Moel Tryfan, Three-Hock Mountain (Ireland), Minera 

 Mountain, and in Macclesfield Forest occur at about the same alti- 

 tude above the sea-level. After proposing a provisional classifica- 

 tion of the drift-deposits of North Wales and the Penine Hills into 

 zones, showing probable variations in the rate of submergence, he 

 concluded by discussing the question whether the submergence was 

 caused by the subsidence of the land or the rising of the sea, without 

 venturing to express any decided opinion on the subject, but in- 

 clining to the former idea. 



2. " On the Correlation of the Upper Jurassic Rocks of England 

 with those of the Continent." By the Rev. J. F. Blake, M.A., 

 F.G.S. Part I. The Paris Basin. 



This was an attempt to settle the many questions of correlation 

 arising out of the detailed descriptions given of the various localities 

 in the Paris basin where Upper Jurassic rocks are developed, by a 

 consecutive survey of them all, undertaken by the aid of a grant 

 from the " Government Fund for Scientific Research." In previous 

 papers the names used for the great subdivisions and their boun- 

 daries were adopted without material modification ; in the present 

 such modifications were proposed as may bring the English and 

 continental arrangements into harmony. 



Five distinct areas were considered in this paper. 1. The southern 

 range ; 2. The Charentes ; 3. Normandy ; 4. The Pays de Bray ; 

 5. The Boulonnais. 



1. The Southern Range. — This is continuous from the Ardennes 

 through the Meuse, Yonne, &c., to the Cher. In the Ardennes the 

 "Ferruginous Oolite" corresponds to our Osmington Oolite, and to 

 the Lower Limestones and Passage-beds of Yorkshire, the under- 

 lying " Middle Oxfordian " being equivalent to our Lower Cal- 

 careous Grit. Above comes immediately the Coral Rag with 

 Cidaris florigemma ; and the stratigraphical and palaaontological 

 break is constantly between the Coral Rag and Ferruginous Oolite 

 when that occurs. The Corallian is a well-marked formation, 

 though its character is variability. It is divisible generally into 

 two groups — Coral Rag and Supracoralline beds, the latter usually 

 being the " Diceras-he&s •" but in the Yonne there is a great de- 

 velopment of Dicer as -beds below, associated with Cidaris fiori- 



