132 
ON THE FOSSIL FLORA OF THE SOUTHERN PORTION OF TF7 
YORKSHIRE COALFIELD IN NORTH DERBYSHIRE AND 
NOTTINGHAMSHIRE. 
BY E. A. NEWELL ARBER, M.A., F.I.S., F.G.S., 
Trinity College, Cambridge, University Demonstrator in Palaeobotany. 
(Plates XII.-XIX.) 
{Bead November Srd, 1910.) 
The systematic palseobotanical exploration of the great 
Yorkshire Coalfield has now been in progress for a consider- 
able number of years. The plant petrifactions, found in the " Coal 
Balls " of the Gannister or Halifax Hard Seam of the Lower 
Coal Measures of Yorkshire, have been described by Binney, 
Williamson, Scott and others. Dr. Kidston has been occupied 
for twenty years past with a study of the plant impressions, 
chiefly of the Middle Coal Measures, especially those from the 
central portion of the Yorkshire basin, and has published two 
papers,^ and six reports'- on the flora of these rocks. The 
plant remains from the Southern extension of the Yorkshire 
Coalfield in North Derbyshire and Nottinghamshire have hitherto 
received little attention, and it is with this district that the 
present paper is concerned. 
PREVIOUS RECORDS. 
The earliest figures of fossil-plants from this portion of the 
Yorkshire Coalfield are to be found in Martin's Petrificata Der- 
biensia, published in 1809. Among the specimens there figured 
are examples from Chesterfield, Alfreton and elsewhere, of 
Alethopteris lonchitica (Schloth.) [—Phytolithus filicites {striatus), 
plate 10] ; Stigmaria ficoides, Stemb. [—Phytolithus plantites 
{verriLCOsus) , plates 11, 12] ; and species of Neuropteris [plate 19], 
I Kidston (96). 
2 Kidston (90). 
