136 ARBER : FOSSIL FLORA OF SOUTH YORKSHIRE COALFIELD. 
Soft Coals at Newthorpe, and at Pye Bridge Railway cutting ; 
from below the Silkstone Coal at Derby ; from the horizon of the 
Kilburn Coal at Trowell and Stanley CoUieries, and from below 
that horizon at Albany. 
THE MIDDLE COAL MEASURE FLORA. 
The Tpp Hard Coal of the Derbyshire and Nottingham portion 
of the Coalfield has been identified by Dr. Walcot Gibson^ with 
the Barnsley Thick Coal of Yorkshire. It may, therefore, be 
interesting to compare the kno^n floras of these two seams — as 
a study of the lateral distribution of plants belonging to exactly 
the same seam over an area of considerable extent. The following 
table affords such a comparison. It includes all the plants re- 
corded by Dr. Kidston from the Barnsley seam in his six reports 
on the flora of the Yorkshire Coalfield. ^ The flora of the Derby- 
shire and Nottingham Top Hard Coal, at least 40 miles south of 
Barnsley, is sho^^^l in the left hand column. The letters there 
used indicate the exact origin of the specimens in the latter 
coalfield, which are as follows : — 
L = Loscoe Clay Pit, Heanor, Derby ; just above the Top Hard Coal. 
D = Digby Clay Pit, Kimberley, Notts. ; just above the Top Hard 
Coal. 
B = Brindsley Clay Pit, Langley Mills, Notts. ; just above the Top 
Hard Coal. 
W = Waingrove Clay Pit, nr. Cross Hills Station, Derby ; below Top 
Hard Coal. 
S = Shipley Clay Pit, Derby ; below Top Hard Coal. 
C = Wollaton Canal Clay Pit, Notts. ; below Top Hard Coal 
All the specimens are from " rakes," or clay ironstone 
nodules, occurring a short distance either above, or below, the 
Top Hard Coal. 
I Gibson (98) pp. 5—7. 
2 Kidston (90). 
