art '2 (■ Vi;i!i>\ I 1 Klv'ol s I.I MKSToNK ok S. NVM.KS ((IAIJI KM). \-i\ 



Fiiuna : 



Corals and brachiopods:- 



( leistofntra cf. geomeirirn Edwards & 

 Haiine. 



Prodnctus art". ha^siii> Vaiighan. 

 Piiftuln 8ubpiistril(>s(t ThDinas. 

 (■honetes cf. hardreitsi.f Phillips. 

 Schellicienella cf. creuistrid (Phillips). 



Cainarotnrliui )nilchel(h'i'uriigi;i 



Vaughan. 

 Spirifer rlatliratiis M'Coy. 

 Syrinyothijriii cf. ruspitJuta (Martin). 

 S}>ii'iferi7ui octoplicata (J. de C. 



Sowerby). mutation ,i^ Vaughan. 

 AthyrtK i-oit<{<!ji L'Eveill'. 

 Enmetna atrbonarin (Davidson). 



Bryozoa : — RJidhdonieson, FenesteJUt. Lamellibranchs : A small .U"</(o/< 

 like species. Ostracods. 



(Jood ex|)usures of the beds are few, ami only two sertioiis, now 

 Ui hv (leseril)e(l, liave yielded any considerable fauna. 



In the strike-valley l)etween Craii:: Llanishen and tlie western 

 end of Cefn-On, and al)out 0(M) yards west of the ('aerphilly 

 railway-tunnel, the northern bank and the bed of a stream ex]>ose 

 Itlaek shales witli a few thin lentieular l)ands of hniestone ((Jlani. 

 :J7 SW X lU). These beds lie at the base of the i^roup, and sueeeed 

 sharply the limestone of the underlying: ii^rou]), which is exjiosed 

 at one jx)int in the southern bank. The thin limestone-bands, of 

 the usual crinoidal and shelly type, contain irrei^ular patches and 

 distinct pebbles of xery line-iz^rained limestone: they have yielded 

 Pusfuht iiubj)/fsftfl(/sa, Prnductua cf. fxissifs, C/ionrfrs cf. har- 

 (/rrnf(is,Sc/if'/hctrnf'na cf. vreniatria, A//it/ris roisst/i, and >St/i'ifif/(t- 

 tht/ris cf. cuspi<l(it<ty the Hrst and last-named bcini; notal»ly 

 common; and they contain ostracods in abundance. 



On the eastern side of the Tatt' i?or«^e, Castell-Coch (Quarry 

 ( tilam. 37 SW \i\) affords the second section, at the point wliere a 

 small bluff of thinly-l)edded limestones and shales protrudes from 

 the scree of limestone-debris at the southern end of tiie quarry . 

 These beds, lyiui^ about the middle of the group, ctinsist more 

 largely of limestone than of shale. The limestones yield C/r/'ufo- 

 l>oi'(( and all the other tyi^'s specified in our faunal list, alK)ve. 

 Prothn'tuH aff. futssifs, SclirllwirufUd vi, crrnixfrln, ('(tiiKimtirrhin 

 inilchcldriuiciisiH, and N/iahdm/irso/f sp. are particularly alnindant. 

 One band of limestone, rich in crinoid-del)ris and l>raehioji(tds. 

 contains ostracods ami a smali Mo<//(t/(i-\\kr shell in abmidancc. 



Castell-Coeh <^uarry also ex|M)ses the ujipermost betls of the 

 gnnip, unfossiliferous niicaccous mudstones innnediatcly umler- 

 lying. and succeeded sliarply by, the dr)lomites that form the Ixise 

 of the Main Limestone. The junetion of Lower Limt'st(»ne Shales 

 and Main Linu'stone is again exposed at the eastern extn-mity of 

 the district here desiribed, in the lowest beds of I)an-y-(imig 

 Quarry, liisca. There, however, w<' tind an alternation of hard 

 sliLrhtlv-dolomitie shale with fiiirh -o-x Ntalbin- doloinltf. 



