84 MR. L. M. PAESoxs OX THE cAEBO>'irEEors [vol. Ixxiii, 



5. The Caeboxifeeotjs Limesto^te hordering the Leicestee- 

 SHiEE Coalfield. By Leonaed Miles Paesons, D.T.C, 

 M.Sc.(Lond.), F.G.S. '(Eeacl March 14tli, 1917.) 



[Plates YII-XI.] 



Contents. 



Page 



I. Introduction 84 



II. General Description of the Area 86 



III. The Western Inliers 87 



IV. The Eastern Inliers 94 



V. Comparison with the Main Midland Area 101 



VI. The Origin 'of the Dolomites 104 



VTI. Summary of Conclusions 106 



VIII. Palffiontological Notes 106 



IX. Note on the Tonga Boring 108 



I. IXTEODUCTIOX. 



The area containing eight inhers of Lower Carboniferous rocks 

 Avith which this paper deals is situated noi-th and east of Ashbv- 

 de-la-Zouch. These inhers of Avonian rocks he within a mdius 

 of 6 miles from Ashbv-de-la-Zouch. and the area forms a quadi-ant 

 with the line Ashbv-Tieknall as the south-to-north radius, and 

 the line from Ashby passing through Thringstone as the Avest-to- 

 east radius. 



The Avesternmost inliers, Ticknall and Calke. are in Derbyshire, 

 as is also part of the Dinniiinsdale inher. The Heath End stream 

 AAdiich flows through the last inlier is there the county boundary. 

 The eastern side of Dimminsdale and all of the remaining inliers, 

 from Bi-eedon to Grraoe Dieu inclusive, are situated in Leicestershire. 



The Carboniferous Limestone of the area has been mentioned 

 but briefly in the Memoirs of the Geological Survey, and the 

 relations of the Lower Carboniferous to the Millstone Grit have 

 not been definitely stated. 



The original surve}" of the district was made by Edward Hull, 

 and his results were published in 1860.1 His map shows a ninth 

 Carboniferous Limestone inlier situated north of Breedon-on-the- 

 Hill. and south-east of Melbourne, but no description of it is 

 given in tlie Memoir, and it is not shown in maps published more 

 recently by the Geological Survey. 



In the same Memoir (1860) a hst of fossils obtained from 

 Ereedon and Breedon Cloud is giA'en; but Hull considered the two 

 Breedons to be alike stratigraphically, and the names of the fossils 

 from the two ])laces were put together in the same list, Avithout 

 any indication as to which Breedon yielded any particular specimen. 



^ ' The Geology of the Leicestershire Coalfield ' Mem. Geol. Siirv. 1860. 



