﻿Vol. 64.] CAKBONIFEROTJS LIMESTONE OF THE MIDLAND AREA. 



51 



Brachiopods : 



Orbiculoidea nitida (Phil.). 

 Seminula amhigua (Sow.). 

 Seminula globularis (Phil.). 

 Athyris cf. ex'pansa (Phil.). 

 Aihyris planosulcata (Phil.). 

 Martinia glabra (Mart.). 

 Martinia Uneata (Mart.). 

 Spirifer bisulcatus. Sow. 

 Spirifer grandicostaUis, M'Ooy. 

 Spirifer planicosta (M'Coy). 

 Syringofhyris aif. laminosa (M'Coy). 

 Syringoihyris sithconica (Mart.). 

 Spiriferina octoplicata, Sow. 

 Ortliothetes cf. crenistria (Phil.). 

 Bhipidomella aff. Mickelini{li'Ei^e\\\.Q). 

 8chizophoria resupinata (Mart.). 

 CamarotcEchia (!) ?iS. flexistrial^hW,). 

 Prodiictus corrugatus, M'Coy, 

 Productus aff. hemisphericus, Sow. 

 Productus giganteus (Mart.). 

 ProducUis latissimus, Sow. 

 Productun striatus (Fischer). 



Productus undatus, Defrance. 

 Productus longispinus, Sow. 

 Productus aff. lobatus, Sow. 

 Productus aff. setosus, Phil., & var. 



tissingtonensis, nov. 

 Productus concinniis, Sow. 

 Productus Martini, Sow. 

 Productus semireticidatus (Mart.). 

 ProdAictus costatus. Sow, 

 Productus scabriculus (Mart.). 

 Productus pustulosus, Phil. 

 Productus sp. (cf. Pr. ovalis, Phil.). 

 Productus Jimbriatus, Sow. 

 Productus punctate -fimbriatus, 

 Productus punctatus (Mart.), 

 Productus spimdosus, Sow. 

 Chonetes cf. hardrensis, Phil. 

 Chonetes crassistria (M'Coy). 

 Chonetes cf. crassistria (M'Ooy), 



Vaughan. 

 Papilionaceous Chonetes. 



This subzone comprises the uppermost part of the Carboniferous 

 Limestone, above the Lonsdalia-suhzone, and includes also the 

 series of alternating shales and limestones which constitutes a 

 passage into the overlying Pendleside Series, wherever such 

 transition-beds are developed. The varying development of the 

 subzone, and its relation to the nature of the junction between 

 the Carboniferous Limestone and the Pendleside Series, are dis- 

 cussed in a separate section (pp. 57-63). 



Diagnosis: — 



The coral-fauna is essentially distinct from that of the 

 Lonsdalia-suhzone. Lonsdalia floriformis is absent^; Dibuno- 

 phyllum and Cyathophyllum reyium are extremely rare ; and 

 the Clisiophyllids generally are poorly represented. Lithostrotion 

 is uncommon, L. Martini, L. irregulare, and L. aff. Portlocki 

 being absent. In its typical development, the subzone is 

 characterized by the abundance of Cyaihaoconia, associated with 

 abundant Zaphrentids of varied types. 



The brachiopod-fauna does not differ in many essentials from 

 that of the Xonsc/a Zia-subzone, although a few uncommon forms — 

 for example Syringoihyris subconica and Spiriferina octoplicata — 

 are characteristic. 



^ Lonsdalia duplicata, which is common only in the uppermost part of Dg, 

 probably ranges into this subzone. Mr. 0. B. Wedd informs me that, in a 

 section near Wirksworth, he has recently found L. duplicata to occur abun- 

 dantly a few feet below the horizon of a typical Dg fauna. 



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