Notices of Memoirs— Charnwood Forest—N. Derby Coalfield. 421 
Birchill Plantation.—Recent research in this exposure has shown 
the identity of the rock with that found at Bardon Hill. On the 
north side rocks belonging to the Felsitic Agglomerate Series have 
also been found. 
Peldar Tor.—The porphyroid exposed in the large quarries contains 
inclusions of other rocks, which have been generally considered as 
segregation masses. An undoubted dyke in the middle of Peldar Tor 
has been exposed. 
Ratchet Hill.—An exposure in this hill shows the presence of 
rocks on the felsitic agglomerate horizon. At the north-west end 
a porphyroid occurs which seems to be identical with the porphyroid 
at Cadman Wood. 
Swannymote and Trilobate.—Rock belonging to the Felsitic 
Agglomerate Series runs between these two places; it has been much 
altered, and has not hitherto been recognised as belonging to the 
felsitic agglomerate. 
V.—A Conrrizution to THE Panmonrotocy or THE NortH Drrpy- 
SHIRE AND Norrs CoaLFiELD, ok THE SourHeRN Parr OF THE 
Norra Mriptanp Coatrrenp. By A. R. Horwoop, Sub-Curator, 
Leicester Corporation Museum. 
SUMMARY was given of the extent and position of the North 
Midland Coalfield. Allusion was then made to the previous 
work connected with the paleontology 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 resurvey 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 Leicestershire and South Derbyshire (in both the Western 
or Moira and Eastern or Cole Orton Districts), i.e. 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, i.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. 
8. The Coal-measures of North Derbyshire are, as a whole, entirely 
confined to the limits of the Grey or chief coal-bearing series (Lower 
