Vol. 65.] CARBONIFEROUS LIMESTONE OF COUNTr CLARE. 



555 



D = Zone of Dibunophyllum aff. turbinatum (Dibunophyllum 

 Zone). 



Lithological characters. — It is hardly possible to record any 

 definite lithological characters in this zone, as the rocks attain a 

 thickness of over 1500 feet, and vary considerably throughout 

 the county. In the northern or Burren district, from which most 

 of the fossils were collected, the limestone at the base is usually 

 dark grey and very crinoidal, thinly bedded, and argillaceous ; 

 it becomes magnesian locally, and contains an abundance of chert. 

 Higher up, the beds vary in thickness from a few inches to 

 several feet ; the limestone is here usually much purer, and is 

 often pale grey and of a finely crystalline texture ; chert is rare. 

 Near the summit occurs locally a compact black limestone, in 

 which chert is found as well-defined bands ; above this, and 

 immediately followed by the black shales of the Pendleside Series, 

 the rock is built up almost entirely of crinoidal fragments, and 

 contains small patches and veins of dolomite. 



Former designation. — Upper or Burren Limestone. 



Subzones 



Faunal list: — 

 Corals : 



D 3 , subzone of Cyathaxonia rushiana. 

 D 2 , subzone of Lonsdalia floriformis. 

 D l7 subzone of Dibunophyllum 6, 0. 



- Alveolites septosa (Flem.). 

 ■ Syringopora geniculate/,, Phill. 



Lithostrotion martini, Ed. & H. 



Lithostrotion irregulare (Phill.). 



Lithostrotion junceum (Flem.). 

 1 Lithostrotion affine (Flem.). 

 ' Lithostrotion portlocki (Bronn). 

 ^ Diphijphi/llum subibicinum 

 (M'Coy). 



Clisiophyllid Lithostrotion. 



Lonsdalia duplicata (Mart.). 



Dibunophyllum of Vaughan. 



Dibunophyllum aff. mtdrheadi, 

 Thorns."" & Nich. 



Brachiopods : 



Productus giganteus (Mart.) and 



allied forms. 

 Productus hemisphericus, Sow. 

 Productus slriatus (Fischer). 

 Productus ' corrugato-hemispheri- 



cus,' Vaughan. 

 Productus cf. corrugafus, M'Coy. 

 Productus punctatus (Mart.). 

 Productus cf. elegans, M'Coy. 

 Prodtictus aff. scabriculus (Mart.). 

 Productus sulcatus, Sow. 

 Productus aff. concinnus, Sow. ■ 

 Athyris expansa (Phill.). 



Dibunophyllum aff. \p, Vaughan. 

 Carcinophyllum sp. 

 Campophyllum aff. marginatum, 



Thorns. 

 Cyathophyllum murchisoni, Ed. & H. 

 Cyathophyllum regium, Phill. 

 Cyclophyllum sp. 

 Zaphreiitis enniskilleni, Ed. & H. 

 Zaphrentis oystermouthensis, 



Vaughan MS. 

 Densiphyllum cf. rushianum, 



Vaugban. 

 Densiphyllum sp. 

 Caninia aff. cornucopia, Mich. 



Athyris planosulcata (Phill.). 

 Davicsiella aff. comoides (Sow.). 

 (Papilionaceous) Chonetes cf. 



cornpressa, Sibly. 

 Chonetes cf. hardrensis, Phill. 

 Seminula ambigua (Sow.), inut. J)\ 

 Martinia glabra (Mart). 

 Beticularia lineaia (Dav.). 

 Spirifer aff. increbescens, Hall. 

 Cyrtina septosa (Phill.). 

 Dielasma aff. virgoides (M'Coy). 

 Dielasma cf. ficus (M'Coy). 



