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1) E. T. Hard man. The chemical composition of Chert and the chemistry of the process, 

 by which it is formed. Trans, of the Royal Dublin Society. 2 Ser. Vol. I, p. 85 — 94; Note on 

 Professor Hull's Paper. Proceedings of the Royal Society of London. Vol. 42, 1887, p. 308—310. 



2) A. Renard. Recherches lithologiques sur les phtanites du calcaire carbonif&re de 

 Belgique. Bull, de PAcad. Royale de Belgique. 2 Ser. T. 46, 1878, p. 471—499. 



3) G. J. Hinde. On the organic of the Chert in the carboniferous Limestone Series of 

 Ireland and its similarity to that in the corresponding strata in North Wales and Yorkshire. Geolog. 

 Magaz. Dec. III. Vol. IV, 16 10, 1887, p. 435—446. 



4) Gttmbel. Geognostische Beschreibnng des Fichtelgebirges. 1879, p. 263. Rotpletz. 

 Radiolarien, Diatomaceen und Spharosomatiten in silurischen Kieselschiefer von Langenstriegis 

 inSachsen. Z. d. D. G. G. Bd. XXXII. 1880, p. 447— 467. T IepHbimeB'&. 06man TeojiornH. 

 KapTa Pocciii. JL 139-wfi. Tpyn,w Peojionn. Kom. T. Ill, As 4, CTp. 207—208; Riist. Beitrage 

 zur Kenntniss der fossilen Radiolarien aus Gesteinen der Trias und der palaeozoischen Schichten. 

 Palaeontographica. Bel. XXXVIII. 1892. p. 107—124; Fox Howard and J. J. H. Tcall. On a 

 Radiolarian Chert from Mullion Island. Q. J. Vol. XLIX. 1893, p. 211—215; G. J. Hinde. Note 

 on the Radiolaria in the Mullion Island Chert, ibid., p. 215—218; G. J. Hinde. Note on a 

 Radiolaria Chert from Fanny Bay, Port Darwin, Australia. Q. J. Vol. XLIX. 1893, p. 221—226. 



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