ON EXCA\'ATI0NS IN THE PAL.EOJiOlC KOCKS OF WALES, &C. 235 



Ft. In. 

 stone ' bed d below, but usualljr showing an admixture of 

 glauconite grains and earthy matter not found in that bed. 

 It is from the grey portions of the bed that I have collected 

 fragments of a large Paradoxides referable, with doubt, to 

 P. Groomii, Lapw. 



b. The Black JAmestone (Callaway and Lapworth) :— 



A very dark rock with rounded quartz grains, much glauconite, and 

 abundant black lumps of phosphatic material. This bed 

 is sometimes found soldered to the overljing conglomerate 

 (rfj), especially in the deeper parts of the Quarry. Near the 

 surface it is, or was (for it is nearly all quarried av/ay at the 

 higher levels), separated from it by clayey matter. 



Maximum thickness 9 

 Hyolitlms fistula (.''), Salferella (perhaps 2 speofes) and 

 Brachiopods. 



c' Grey Limestone and Fault rock . , . . , .09 



d. The ' French Grey Limestone ' : — 



A pinkish grey compact limestone becoming purple or red in 

 places and crowded with fossil fragments, which are shown 

 upon the yellowish weathered surfaces, without glauconite or 



phosphatic inclusions 10 



Aristozoe, cf. A. rotnndata,, Walcott, and Brachiopods. 



• *■••••...« 



e. The Olenellits Limestoiie : — 



A red and green deposit, sandy as a rule and almost shaley in the 

 upper part, but becoming very calcareous in certain layers, from 

 the presence of nodules of compact sandy limestone the 

 weathered surfaces of which exhibit abundant fragments of 

 OleneUus about 2 6 



The fossils detected include OleneUus {Holmia) Callavei, Lapw. ; 

 Anomocare sp. ; Agraulos, possibly two species; Microdiscvs 

 sp., cf. M. Helena, Walcott; HyoUthus sp., probably nov.; 

 H. soaialis, Linnrs , Linnarsonia and other Brachiopods. 



f. The ' Lower Comley Sandstone ' : — 



/, Soft red and green micaceous sandstone, with sandy shales in 



thin layers 4 



Part II. — Hocks exposed by the new excavation. 



f„ Green and rusty micaceous sandstones, being the downward 

 continuation of /„ in beds 1 to 3 feet thick, with at least 

 three separate layers (situated at 7, 11, and 14 feet below 

 the base of the OleneUus Limestone), exhibiting rusty spots 

 weathering out into cavities ' . . 27 



f^ Green micaceous sandstone rather softer in texture than e„, 

 weathering brown, in thin beds 1 to 2 inches thick (base not 

 seen 20 



Total thickness observed . . 80 



West End of Section. 

 Note.— Similar sandstones to the above (/) are traceable at intervals along the 

 roadside for a distance of twenty yards south-westerly from the end of the 

 excavation, indicating (if there is no repetition and the dip remains constant) a 

 further downward thickness of the sandstone on the E. and W. line of section of 

 about 40 feet. 



' The rock marked c probably represents some portions of the 'Orei/ Linwstonei 

 of Section No. 2, p. 6, but is a good deal crushed by strike faulting. 



