^ol. 57.] TENDLESIDE GROUP AT PENDLE HILL, ETC. 401 



remains, our slides show all stages in the transformation of a siliceous radio- 

 larian into a structureless ball or disc filled with calcareous 

 matter or into a mere patch of clear crystalline material.' 



The foregoing passage precisely describes the condition seen in oar 

 slides. 



The limestone of Wooladon Quarry, near Launceston, described 

 by Dr. Hinde & Mr. Fox in vol. li (1895) of this Journal, p. 633, as 



' finely granular, with some traces of calcareous organisms and a few rounded 

 bodies, now infilled with calcite, which may possibly be casts of radiolaria,' 



seems to be similar to these Pendle rocks. 



Unfortunately there is not sufficient development of chert in the 

 hard black rocks to enable us to trace the form of the bodies more 

 clearly : where chert does occur, it is usually in the softer black rock, 

 and generally shows sponge-remains only. Whatever these organ- 

 isms may eventually prove to be, they are singularly constant in 

 their occurrence in the Pendleside Limestone of the black type, for 

 we find them on Pendle Hill ; Denning Dale, near Skipton ; Flashy 

 Fell ; Poolvash (Isle of Man) ; Barber's Booth, in the Peak ; Dove- 

 holes, near Castleton, and at Stanton Leys (Derbyshire) ; Morridge 

 and the Dane Valley in Stafford shire; Pule Hill, Marsden (Lancashire); 

 and at other places within our area. Though usually, they are not 

 invariably, present in these limestones ; thus at Tolls Wood, Stanton 

 (Derbyshire), a dark rock with small lenticular patches of chert 

 lying parallel to the bedding shows scarcely any whole organisms 

 at all, and only a little fragmentary material lying very regularly in 

 an opaque reddish to black groundmass, which is finely laminated 

 and full of plant-fragments. The chert in this rock is dark -yellow 

 in section and no organisms are seen in it, though certain rounded 

 outlines may mark the position occupied by foraminifera. 



At the fall in the stream under Pendleton Hall the radiolarian (?) 

 casts are fairly abundant, together with faint indications of goniatites, 

 in a peculiar rock, greenish-brown on weathered surfaces, but blue 

 on fresh surfaces, blotched with purple and grey patches, very hard 

 and compact, and exhibiting a tendency to conchoidal fracture. In 

 section, it is seen to possess a finely granular crystalline structure, 

 and is stained irregularly with iron -oxides. 



Whether these bodies have been radiolaria or not is a question 

 which we hope before long to settle definitely. Meanwhile they 

 certainly invite comparison with the better defined, undoubted 

 radiolaria of the Culm, more especially as they are associated with 

 an almost identical fauna. 



ArPENDicEs A & B (facing p. 402). 



The accompanying tables, drawn up from personal collecting and 

 from notes of well-authenticated specimens in public collections, 

 demonstrate — firstly, the essential differences in the faunas of the 

 Carboniferous Limestone and Yoredale Series from that of the 

 Pendleside Group ; secondly, the similarity of the fauna found in 

 the massive Carboniferous Limestone of Clitheroe, Derbyshire, and 



