428 TRANSACTIONS OF 'SECTION C. 



Bold Venture Quarry, Horrocksford Quarry, and several other exposures snow 

 beds in probably Lower C. with numerous small Zaphrentids (chiefly Zaphrentis 

 Omaliusi, with the variety ambigua of Mr. R. G. Carruthers very common). 

 Higher parts of these beds contain Canin-'a cylivdrica, which has been found 

 at Brungerly Bridge, in Bold Venture Quarry, at Pimlico, and at Downham. 

 This species is not so common or well-developed as in beds farther east, towards 

 Hellifield and district. Among the brachiopods are Chonctes comoides, Ortho- 

 tetes crenisiria^ &c. Large gasteropods such as Euomphalus ptntangulatus and 

 BelleropJion cornuarietis are common. C'onocardium hibernicum is a characteristic 

 lamellibranch. 



Above these beds come the lowest beds with Productus sub-Icevis, and the 

 Knoll beds of Coplaw, lower part of Worsaw, &c. Here are the typical 

 C. knolls with numerous brachiopods, the gasteropods mentioned above, but 

 few corals. Amplexus coralloides is, however, common and Michelinia sp. 



Above these are well-bedded crinoidal limestones, leading up to the probably 

 C.-S. knolls of Salt Hill, Bellman Park, Worsaw, &c. These beds contain a rich 

 brachiopod fauna, quite distinct, however, from that of Elbolton. Whilst 

 Productus pustulosus, Pr. semireticularis, Spirifer striatus, &c., are quite 

 common, one never finds Pr. striatus, Pr. martini and other D. forms so common 

 in those eastern knolls. 



A fairly rich coral fauna has lately been discovered in these C.-S. or S. 

 knolls ; it has not yet been worked out, however. There is probably an uncon- 

 formity at this level, and then there succeeds a great thickness of shales with 

 limestones, with few fossils. These would appear to be on the same horizon as 

 the richly fossiliferous beds of Elbolton. Above these shales with limestones 

 come the Pendleside limestones, black limestones with cherts, and with irregular 

 bands of more fossiliferous limestone. The Ravensholme limestone appears to 

 be similar and to contain some of the same fauna as the highest limestone at 

 Cracoe and the limestone of the railway quarry at Rylstone described by the 

 writer. 



The Sabden shales succeed these beds, and lead up to the Millstone Grit 

 series. A map was exhibited on which some of these generalisations were 

 shown. 



5. A Brief Criticism of the Fauna of the Limestone Beds at Treak Cliff 

 and Peakshill, Castletofi, Derbyshire. By Henry Day, M.Sc. 



The author put forward some observations on a collection of some three hundred 

 species of Carboniferous Limestone fossils from the localities Treak Cliff and 

 Peakshill, Castleton, and embracing about one hundred species of brachiopods and 

 corals. The beds at both places may be referred to the ' brachiopod beds ' 

 of Sibly (' Q.J.G.S. 1908'), and what are allocated by him to sub-zone D^ — 

 the Lonsdalia sub-zone. The present list of species presents some features of 

 considerable interest bearing on the value of certain types as zonal indices. 

 Reference is made to Vaughan's paper on the Bristol area, where it is indicated 

 that amongst the brachiopod groups confined to the Tournaisian in that area are 

 the following: Productus of. Martini; Leptena analoga; Schizophoria resu- 

 pinata ; Bhipidomella aff. Michelini ; Spiriferina octoplicata ; Syringothyris 

 cuspidata. Two of these, it is noted, Spiriferina octoplicata and SchizopJioria 

 resupinata, are sub-zonal indices, and each with its maximum in its sub-zone. 

 The list of Castleton forms from well up in D, now presented, includes all the 

 above-mentioned bracliiopod groups. Syringothyris cuspidata and Spiriferina 

 octoplicata are fairly abundant at both Treak Cliff and Peakshill, Schizophoria 

 resupinata is extremely abundant at both places, Leptena analoga is abundant, 

 whilst Productus cf. Martini and Rhipidomella Michelini are rare. 



Passing to the coral fauna, the genus Zaphrentis appears in the Castleton 

 list, i.e., one of the two genera of corals confined to the Tournaisian in the 

 Bristol area and not extending into the Visean. The genus, though not very 

 abundant, is represented by several species. In addition, the genera Michelinia 

 and Amplexus, characteristic of the Upper Tournaisian of Bristol, but possibly 

 extending into the base of the Visean, are cited in the Castl 3ton list, Michelinia 



