74 Geological Society. 



recently exposed certain marine beds overlying the Lower Headon 

 (freshwater) series, and containing fossils hitherto unknown in 

 England, but which, as Herr von Koenen showed, constitute the 

 marine equivalent of the Middle Headon strata. 



The author gave an exposition of the current opinions upon the 

 correlation of those English and Foreign " Upper Eocene" or 

 " Lower Miocene " strata, to which Professor Beyrich has given the 

 name " Oligocene," and briefly sketched their distribution and limits 

 upon the continent. He then gave a list of fifty-nine New-Forest 

 (Middle Headon) fossils, which he had determined, and stated that, 

 of this number, forty-six occur in the Lower Oligocene of Ger- 

 many, and twenty-three are characteristic of that formation ; twenty- 

 one of these species occur in the Barton Clay, four in the Middle 

 Oligocene, and eight are peculiar to the Brockenhurst beds. He 

 therefore concluded that the Headon and Brockenhurst strata are on 

 the same horizon as the Lower Oligocene ; and he confirmed the 

 opinion of previous observers — that the Hempstead beds are the 

 equivalent of the " Gres de Fontainebleau " and of the Middle Oli- 

 gocene of Germany. 



2. " On the Liassic Strata of the Neighbourhood of Belfast." 

 By Ralph Tate, Esq., F.G.S. 



In the neighbourhood of Belfast the following members of the 

 Lias formation were stated to occur, namely : — The Zone of Ammo- 

 nites Bucklandi, the White Lias, and the Zone of Avicula contorta. 



The characters of these subdivisions in the district under con- 

 sideration were described in detail by Mr. Tate, who gave sections 

 of the beds exposed in Colin Glen and at Cave Hill, at which loca- 

 lities the three zones are seen ; he also gave sections of the Avicula 

 contorta beds as exposed at Woodbarn and at Whitehead, and lists 

 of the fossils found in the strata of each subdivision at the localities 

 mentioned, noticing that, in the zone of Ammonites Bucklandi, that 

 Ammonite is replaced by A. intermedius, the other fossils being of 

 the same species as occur in that zone in England ; and he con- 

 cluded with some general remarks on the distribution of the members 

 of the Lias in the North of Ireland. 



3. " Notes on the Devonian Rocks of the Bosphorus." By 

 W. R. Swan, Esq. In a letter to Sir R. I. Murchison, K.C.B., 

 F.R.S., F.G.S., &c. 



The lithological and stratigraphical characters of the rocks of the 

 Bosphorus having been noticed, the author gave a general descrip- 

 tion of the fossils occurring in them, — namely ,Spir if 'er (broad- winged 

 and small species), Orthis, and other Brachiopods ; Homalonotus and 

 other Trilobites ; together with Corals of the genus Favosites asso- 

 ciated with the well-known Pleurodictyum problematicum. Grapto- 

 lites were stated to be entirely wanting, and Cephalopods to be very 

 rare. Mr. Swan therefore inferred that these strata were of the age 

 of the Lower Devonian rocks of the Rhine. 



