514 TRANSACTIONS OF SECTION C. 
6. Report on the Faunal Succession in the Carboniferous Limestone of the 
South- West of England.—See Reports, p. 313. 
7. Report on the Exact Significance of Local Terms. 
8. A Contribution to the Paleontology of the North Derbyshire and Notts 
Coalfield, or the Southern Part of the North Midland Coalfield. By 
A. R. Horwoop. 
A summary was given of the extent and position of the North Midland Coal- 
field. Allusion was then made to the previous work connected with the paleon- 
tology of the district. This was very limited, and the correlation of the Top 
Hard Coal with the Main Coal of Leicestershire, and of the Black Shale with the 
Arley Mine of Lancashire, had not been founded on fossil evidence. 
Recently the re-survey of the district by the Geological Survey and some 
important borings had added much to our knowledge of the fossil flora and fauna 
met with. 
As a result of these investigations, and by the aid of a summary of all the 
previously recorded organic remains from this area, the author was able to arrive 
at the following conclusions :— 
1. That the flora of the Top Hard Coal, as afforded by specimens from 
Pleasley, indicates that it is of the same age as that of the Main Coal of Leicester- 
shire and South Derbyshire (in both the Western or Moira and Eastern or Cole 
Orton districts), z.¢., of Middle Coal-measure age, occupying a position rather more 
than midway in that division of the Coal-measures. 
2, The fauna of the horizon at Mansfield, Notts, 630 feet above the Top Hard 
Coal, indicates, as pointed out by Mr. Walcot Gibson, a horizon equivalent to the 
Gin Mine or Twist Coal of the North Staffordshire Coalfield, z.e., near the top of 
the Middle Coal-measures and commencement of the Transition series, or Black 
Band group, which would occupy a position slightly higher. Eastward and above 
this horizon the whole of the Upper Coal-measures are represented, though feebly 
developed. 
3. The Coal-measures of North Derbyshire are, as a whole, entirely confined 
to the limits of the Grey or chief coal-bearing series (Lower and Middle Coal- 
measures), like the Leicestershire and South Derbyshire Coalfield, of which it is 
a continuation; and none of the Red series (or Transition series and Upper Coal- 
measures) of the North Staffordshire type are met with in this area west of a line 
somewhat east of the Nottinghamshire and Derbyshire county boundary between 
Bolsover and Stanton—though this line probably curves westward in the north, 
just south of Rotherham, and eastwards, south and south-east of Nottingham. 
A summary of the fossil flora and fauna of North Derbyshire and Notting- 
hamshire, as at present known, was given, with the horizon and locality of the 
specimens cited. This, though preliminary, was in extension of the work already 
accomplished in the Leicestershire and South Derbyshire Coalfield, shortly to be 
ublished, and in other fields, and supplementary to the work of Ward, Hind, and 
Btobbs in the North Staffordshire Coalfield on the mollusca and fish fauna of 
that area, and of Kidston on the fossil floras of Yorkshire and North and South 
Staffordshire. 
9. Report on the pre-Devonian Beds of the Mendips.—See Reports, p. 315. 
