DISTRIBUTION. 1 73 



1855. M'Ooy, 'British Palaeozoic Fossils,' — continued. 



SitiKjtuiiolitcx clava is Sanguinolites maximns. 



„ subcarinatiiB „ „ subcarinatus. 



Leptodomus costellatus „ „ costellatus. 



Cardiomorpha orbicularis „ Cardiomorpha orbicularis. 



DISTRIBUTION. 



During my study of the Carboniferous Lamellibranchs certain facts as to their 

 distribution have been forced on my notice, and have led me to publish my views 

 of the Carboniferous succession in Great Britain, and the various homotaxial 

 equivalents of the Carboniferous deposits in each division of the Kingdom. The 

 Carboniferous sequence of Scotland and the North of England differs very 

 materially from that which obtains in the Midlands, where on the top of the Massif 

 of Limestone, some 2000 to 3000 feet thick, some 1000 feet of black shales and 

 limestones occur, characterised by a fauna very different from that which is found 

 in the Limestone below. To this series, which was formerly called Yoredale, in 

 conjunction with my friend Mr. J. A. Howe, 1 I ventured to assign the name 

 Pendleside Series, on the ground that its lithological characters and fauna were 

 distinct from those occurring in the series known in Wensleydale and the North 

 as the Yoredale Series. 



The Pendleside Series, then, occurs between the Carboniferous Limestone Series 

 and the Millstone grits. The series has a well-defined base, but passes upwards 

 insensibly into the Millstone grits, which contain a similar fauna. The Pendleside 

 Series does not extend farther north than a line passing from Grassington in Craven 

 to the south part of the Isle of Man. Beds with the characteristic fauna are to 

 be traced west to the West of Ireland, where they are present at Foynes Island, 

 Co. Limerick, and in Co. Clare. 



Mr. Kidston sent me some months ago a suite of badly preserved fossils from 

 the Arigna mines, Carrick-on- Shannon, which appear to me to indicate a Pendle- 

 side horizon, but higher than the base. The fauna is also present in Co. Dublin, 

 Co. Meath, and on each flank of the Kilkenny Coalfield. 



In the south of Co. Cork and Co. Kerry the Carboniferous Limestone 

 is absent, and black shales with Posidonomya Beeheri, which fossil is characteristic 

 of the lowest part of the Pendleside Series, rest on the Coomhola Grits. The latter 

 contain Cucullaea Hardwigi and Ptychopteria Darnnoniensis, fossils characteristic of 

 the Upper Devonian, and therefore should not be referred to the Carboniferous Series. 

 It is evident that in S. W. Ireland, at the old head of Kinsale, the same sequence 

 obtains as in North Devonshire. That is to say, the Lower Culm and Venn Lime- 

 stone Scries with P. Becheri rest on a series with Upper Devonian fossils, the 

 1 'Quart. Journ. Geol. Soe.,' vol. Ivii. p. 347. 



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