

part 2] LIMESTONE OF THK I.KHESTERSII I UE rUA I.FI KM). 05 



the \vestx*rn side of the hill and working ea>t\var(ls, we see that 

 the main sululivisioiis are as follows, in descentling order: — 



4. Pink and red cloloniite. 

 3. Yellow dolomites with some chert. 

 '2. Thickly-bedded yellow dolomites with no chert, but yielding 



Product 11^ }iiimernx}(s. 

 1. Yellow dolomites and doloraitic limestones yielding Lithostwtion 

 [^ irre(julare, Cyathophyllid conils of the C. inurchinoni type, etc. 



(Base not seen.) 



Total thickness = about 850 feet. 



Sinee the exact houndaries of these subdivisions are not elearly 

 seen, I prefer not to assii^n definite thieknesses to them ; hut the 

 D, ])ortion of the seijuenee ( I and 2) probahly exceeds 500 feet. 

 The totitl thickness, which is here i^reater than that at any other 

 inlier north of the Leicestershire Coalfield, is such that, apart from 

 palieontological evidence, it is justifiable to snpiK)se that the lower 

 beds on the eastern side of the hill must represent some portion of 

 the D, limestone of the main ^lidland area.^ A s})ecial ])oint to 

 be noted in this connexion is the entire absence of igneous material 

 on the horizon of the ' toadstones ' of Derbyshire. As the lower 

 ]x:>rtion of the Hree«lon-Hill limestone is of I), age, it must be 

 concluded that the area under considerati(Ui was beyond the south- 

 eastern limit of the vulcanicity associated with the Carboniferous 

 Limestone of the Pennine Chain. Dr. H. H. Bemrose in his 

 paper on 'The Toadstones of Derbyshire,*' refers to the thinning- 

 out of the igneous material in an easterly direction, and draws 

 attention to the absence of the 'upper toadstone ' at Crieh. only 

 a few miles east of Matlock. - 



Paheontology of Breedon-on-thc-llill. 



The comparatively V»arren nature of the whole of the beds ex- 

 posed at Breedon is indicated by the fact that hitherto but two 

 8])ecies : namely, Product ax luancroaiis and SyriiUfoflnfris (.*) 

 cu8j}i(fafa, have been quoted from this inlier ; however, after a 

 prolonged search, in which every available rock-face was examined, 

 I have ol)tiiined sutHcient specimens of corals and brachio|)ods 

 to fix the horizon «»f the uppermost beds with certainty, and to 

 leave little doubt that the lowest beds belong to the D, sub-zone. 



Fauxal List. 



Subdivisions indicated by numerals corresponding to those in 



the succession tabulated above.] 



Upper Beds on the western side of the hill. 



fZnphrentis»p. (r f»nnVAiZteui Edwards »t Haime). r. 

 _ , .. I Beaumontut e(jertoiii Edwards Jt Hainie. r. 

 A Dart f ^■'^fhotitmtion sj». r. 



.gj ' I>i I'fi y phijU lint lift, r (I nr ill II tint Lonsdale, r. 



Sfiirifer jilniiii-ontii M'C'oy. r. 

 [^Product Hit antiiiinitiiti Sowerby. r. 



' See Prof. T. F. Siblya paper, Q. J. O. S. vol. Ixiv (1908) p. 38. 

 ' Ihid. vol. Ixiii (1907) p. 266. 



