43X) Geological Society. 



beds are chai-acterized by numerous large gasteropods. Prodticfiis 

 Jmmerosus (sublcBvis) marks an equally important horizon iu 

 Upper C, as it does in tlie Belgian Province. 



I) beds are peculiar in the western part of the Clitheroe Province, 

 and are largely represented by shales, mudstones, and thin earthv 

 limestones; but in the north and north-east, in the Settle anil 

 Burnsall districts, thick, fossiliferous, obscurely-bedded hmestoncs 

 with a rich brachiopod and moUiiscan fauna occur. 



The Pendleside Series is well developed, and practically the whole 

 sequence is exjjosed on the north-western flank of Pendle Hill. 

 This series can be subdivided into life-zones by the Goniatites. 



The lower 300 feet consists of well-bedded earthy limestones 

 with much chert, characterized by the presence of Frolecanites 

 compressKrS. As a rule, there is a well-marked limestone horizon, 

 which the Authors name the llavensholme Limestone (from a farm 

 of that name at the north-eastern end of Pendle) ; this limestone 

 contains Zaplirentis amplexoides, Cyathaxonia rushiana, Miche- 

 linia tenuisepta, and M. parasitica, and the fauna is a very 

 important and constant feature throughout the whole province. 

 The Ravensholme Limestone is an important part of the ' Pendle- 

 side Limestone ' of the late Mr. K. H. Tiddeman. 



The Pendleside Limestone is succeeded by hard, black, calcareous 

 shales with Gli/phioceras striatum, Nomismoceras rot if or me, and 

 J?osido)iomya becheri ; and these in turn by the Bowland Shales 

 of Pliillips, which contain the zones of GJypliioceras spirals and 

 Glt/phioceras hilinqtie. 



The Upper Pendle Grit succeeds the zone of Glt/pliioceras 

 hiliiifjue, and is the homotaxial equivalent of Farey's Grit of the 

 Peak Country, 



An important hoi'izon occurs between the Kinderscout and the 

 Millstone Grit — Sabden Shales — characterized by a rich fauna with 

 Glyphioceras heyrichianum and Glyphioceras reticulatum. Tt is 

 considered probable that the well-known fossiliferous Hebden- 

 Bridge Beds may be on this horizon rather than in the Pendleside 

 Series. 



Table of Goniatite Zones. 

 ' Middle " Coal Measures. Gastrioceras carbonanum von Buch. 



Lower Coal Measures. ~ Gastnoceras carbonarium von Buch. 



Upper Millstone Grit. Gastrioceras listeri Martin. 



Sabden Shales. Glyphioceras diadema Beyrich. 



j r Shales below Millstone Grit, r Ghjphioceras bilingue Sklter. 



, , Q, , -i Glyphioceras reticidatum Vhilli-pB. 



L Glyphiocei'as sjnrale Phillips. 

 Glyphioceras striatum Phillips. 

 Posidonomya becheri r Nomismoceras rotiforme Phillips. 

 Shales. |^ Prolecanites compressiis Sowerby. 



Carboniferous Limestone D^. Glyphioceras crenistria Phillips. 



fk 



