228 Reports & Proceedings — Geological Society of London. 



The occurrence of the same type of frontal bone with the same type 

 of lower molar in two distinct localities, adds to the probability of 

 their belonging to one and the same species. With these remains 

 were found brown flints in great abundance, and one rolled portion 

 of a lower molar tooth of Rhinoceros in the same highly mineralized 

 condition as the derived Pliocene teeth at Piltdown. 



In an Appendix, Professor G. Elliot Smith expresses the opinion 

 that the endocranial cast of the fragment of frontal bone presents 

 features more primitive and more ape-like than those of any other 

 known member of the human familv. 



2. March 14, 1917.— Dr. A. Smith Woodward, F.R.S., Vice-President, 



in the Chair. 



The following communication was read : — 



"The Carboniferous Limestone bordering the Leicestershire Coal- 

 field." By Leonard Miles Parsons, D.I.C., B.Sc, F.G-.S. 



The inliers of Carboniferous Limestone situated along the northern 

 border of the Leicestershire Coalfield crop out in two well-defined 

 series — a Western series composed of almost horizontal beds exposed 

 by stream-erosion, and an Eastern series in which the limestone is 

 highly inclined and complicated by faulting. The thinly-bedded 

 limestones, shales, and dolomites of the Western inliers are of 

 a slightly higher horizon than that of the uppermost beds of the 

 more massive dolomites seen at Breedon and Breedon Cloud farther 

 eastwards. In no part of the district is the base of the Carboniferous 

 seen, although borings have shown that the limestone rests upon 

 pre-Cambrian rocks in the neighbourhood of Charnwood Forest. 



The dolomites of the area yield evidence of two distinct periods of 

 dolomitization — one pre-Triassic, the other subsequent to the Trias. 

 During the former period the bulk of the rock was dolomitized. 



The fauna of the limestones and dolomites indicates the presence 

 of palseontological horizons ranging from D x to D 2 -D 3 inclusive. The 

 Di portion of the sequence, consisting of thickly-bedded dolomites 

 without chert, contains a fauna similar to that of the Caldon Low 

 facies of the south-western part of the Main Midland Province, the 

 rare species Productus humerosus being found at Breedon and Breedon 

 Cloud. 



Unlike the rocks of the Di subzone of Derbyshire, the corresponding 

 beds in Leicestershire contain no igneous rocks equivalent to the 

 " 'loadstones ". Higher dolomites with chert, equivalent to the 

 cherty limestones of Derbyshire, yield a D2 fauna, which somewhat 

 resembles that of the localized development of the Lonsdaleia subzone 

 in the south-western part of the Midland area, in the region of 

 Wuterhouses. 



A typical D3 development is not present in Leicestershire, although 

 the upper barren dolomites of Ticknall may represent part of the 

 Cyathaxonia subzone of other districts. 



The Pendleside Beds are poorly represented by about 30 feet of 

 blue shales, which are succeeded conformably by the Millstone Grit. 



