14S MR. F. dixp:y and prof. t. f. stblt oy the [vol. Ixxiii^ 



The pseudobreccias, like those of Gower, are highly foraminiferal. 

 The peculiar structure of these rocks, which has been attributed 

 b}" Mr. E. E. L. Dixon ^ to the patchy and early recrystallization of 

 a calcareous mud, results in a characteristic honeycomb-weathering. 

 Beds of red-stained, rubbly limestone are associated with the 

 pseudobreccias. At a high level in the subzone are developed 

 some dark-grey fine-grained limestones, approximating to calcite- 

 mudstones ; they contain Calcisplicera (I) and many foraminif era. 



Fauna: 



Corals and brachiopods : — 



Syi'iiujopoia !ipp. — X 4. Prodnctus hemispliericus J. de C. 



Alveolites septosns (Fleming), 'Edw&jvdii Sowerby.— X 4, X 5. 



& Haime. — X4. Prodvctvs cf. giyanteus (Martin). — 



CyatJiophylbim murchisoni EdAvards X 3, X 4. 



& Haime.— X 3, X 4, \ 5. ' Papilionaceous Chonetes. — 3, X4. N.~. 



Lifhostrotiou irregulare (Phillips). — Spirifer cf. striatus (Martin). — ^ 4 



\ 3, A 5. ; (rare). 



Lit! tost rot ion martini Edwards & Martinia c/labraiMsivthi). — X 4 (rare). 



Haime. — \ 3. I Cyrtina septosa (Phillips.). — X 4. 



Carcinophylhim vaxighani Salee. — \ Semi/nda Jicoi(7(^.^ Yaughan. — X 3, X 4, 



\ 3, X 4.' 1 X 5. 



Dibnnoiyiii/lhini 9 YaAighkji. — X 3, X 4. Athyris cf. expansa Davidson, non 



A 5. ' J (Phillips).— X 4, X 5. 



X 3. X 4, and X 5 are localities near Ruthin, in the 6-inch sheet Glamorgan 

 41 NW, to be described immediately. 



The following are the best exposures of the D^ beds in the 

 outcro]) around Kuthm : — 



Quarry (Glam. 41 NW X 3), immediately north of the Roman Camp. Ruthin. 

 This expo-<es a level at or very near the base of the Dihii iioph yllum Zone. 

 The rocks are highly-crystalline grey limestones, in several beds of which 

 DihniiopIiyUiiniO is extremely abundant. 



Old Quarry (Glam. 41 NW X 4), 100 yards north of Tyle-gwyn, west of 

 Ruthin. This secticm, Ijang much higher in the subzone, shows pseudo- 

 breccias and rubbly limestones. 



Exposures (Glam. 41 NW X 5). on the northern edge of Coed Garwa, east 

 of Rutliin. • These show highly-fossiliferous beds of pseudobreccia, rubbly 

 limestone, and finely- saccharoidal gTey limestone. One band has yielded 

 P3'gidia and a cranidium of Griffitl/ideti sp. 



East of a point about midway between Kuthin and Llanharrv, 

 the D, beds, in so far as they have not been overstepped by 

 the Millstone Grit, are almost wholly concealed by Keuper and 

 Glacial drift. But a small, disused quarry, at Llechau Farm, half- 

 way ])et\veen Llanharrv and Brvnsaddler, has yielded Dihiniophyl- 

 hon d and Lithoiitrotlon irrecjulare ; and the spoil-heap of an 

 abandoned iron-mine situated north-west of Brvnsaddler, and about 

 100 yards south-east of Ty-du Beservoir, contains blocks of grey 

 crinoidal limestone which have yielded Dihniw^jhi/lhtm 6. These 

 are the most easterly indications of the D/bffHophi///iff)i Zone. 



Gower paper, pp. .507-11. 



