TRANSACTIOKS 01'' SECTION C. 665 



It is an analcite-diabase, 96 feet thick, of coarse texture in the middle and 

 finer grained towards tlie margins. The slates in contact are converted into com- 

 pact spotted slate. 



Intrusions of similar age and ainost identical character have been described 

 from Counties Donegal, Armagh, Wicklow, and other parts of Ireland, and a 

 close parallelism can be drawn between these rocks and those in the Eerwyns 

 The intrusions of Sheets Nos. 1, 2, and 3 probably date from the interval between 

 the deposition of the Bala series and the overlying slates and grits of ^^'enlock 

 age. No. 4 may be of a later date. 



7. The Llanvirn Beds in Carnarvonshire. By W, G. Fearnsides.^ 



The author gave a brief account of the occurrence of beds with tuning-fork 

 graptohtes from the following new localities in Carnarvonshire, which practically 



y'ards 



N. of bridge over Dwyfawr, 1 mile is . of Llanfihangel-y-pennant '; (4) 200 yards 

 from outlet of Llyn-cwm-dulynon both sides of lake ; (.5) tips from mine workings 

 near Ffald, 2 miles S. of Nantlle ; (6) manganese workings near Llyn-cwm-silyn • 

 ^n'X ^°'^ "If..^" ^^^ Tal-y-mignedd ; (8) gully on S. side of Llyn Cwellyn', 

 300 yards N.W. of river entry ; (9) Snowdon Eanger Hotel; (10) bifurcation of 

 paths to Llanbens and Snowdon from Snowdon Eanger Hotel; (11) Bwlch-y- 

 maes-cwm and the Hanks of Moel-cynghorion and of Moel-goch for about a mile 

 from the Bwlch; (12) Cwm Brwynog. 1 mile N. of Bwlch-y-cum-brwynoo- • 

 (13) slate quarry trial about 200 yards N.W. of the halfway house oil the 

 Snowdon-Llanberis track, 



8. On the Fossil Flora of the Ardwick Series of Manchester. 

 By E. A. Newell Arber, M.A., F.L.S., F.G.S. 



The Ardwick Series of Manchester forms the highest portion of the Coal- 

 measures of the great South Lancashire Coal-field. The plant remains in the 

 shales associated with the Spirorbis Limestones of this series have been already 

 mentioned or described by Williamson, Salter, and especially by the late E. W. 

 Binney. A revision of these records has been recently undertaken with a view to 

 determining the true position of the Ardwick Series in the Coal-measures as indi- 

 cated by the character of the flora. Tor this purpose Binney's collection, now in 

 the Sedgwick Museum, Cambridge, has been re-examined, and several further 

 identifications have been made. The flora is found to belong to a pak-eobotanical 

 horizon known as the Upper Transition Series, which is antecedent to the true 

 Upper Coal-measures, and which is represented in several English and Wel^h 

 Coal-fields. The Lower Bennant Grits in the South Wales, and the New Rock 

 and Vobster Series in the Somersetshire Coal-fields belong to this horizon. 



9. Bejwrt of the Committee on the Faima and Flora of the Trias of the 

 British Isles.— See Reports, p. 219. 



10. On the Base of the Keuper in South Devon. By Alex. Somervail. 



The author, while appreciating and agreeing with the work of Dr. Irvin"- and 

 Professor Hull - on ' The Eed Rocks of Devon,' takes exception to one point refatin'- 

 to the case of the Keuper. 



' The Paper will be published in full in the Geological Manacine. 

 ' Qnar. Jovr. Geol tSop. vols, jjliv., xlviii, and xlix. 



