182 Dr Airber. On a little-known 
necessary to abandon the provisional suggestion as to the name 
employed here. At the present stage of our knowledge, however, — 
the term Oxfordshire Coalfield seems to be the simplest solution — 
of the difficulty. 
Assuming that we are dealing in the case of these two borings 
with one and the same coalfield, the next point to consider is the 
evidence of the palaeobotanical horizon. No plant remains appear 
to have been found at Burford, nor are any recorded. The small 
- flora recorded from Batsford is unfortunately not sufficiently large 
to be quite conclusive as to the horizon. However there is no — 
doubt that it must. belong to either the Upper, or the Transition — 
Coal Measures. The most important and abundant species are 
Pecopteris Miltons (Art.), Neuropterts Scheuchzert Hoffm., N. 
rariervis Bunb., and Cordartes principalis (Germ.). The last 
is nob an Upper Coal Measure plant. All the other species are 
commonly associated in Kent as a Transition Coal Measure 
assemblage. Two other Neuropterids (VV. flecuosa Sternb. and 
NV. ovata Hoffm.) are also frequent on this horizon, though, like 
the others, not confined to it. Thus, while admitting some un- 
certainty as to the horizon, I am impressed with the possibility 
of it being Transition Coal Measures. 
From this reconsideration of the evidence I arrive at the 
provisional conclusion that, in the Oxfordshire field, there are 
probably Transition Coal Measures of a red-grey facies. 
These measures at Batsford overlie Silurian rocks, and are 
probably near an outcrop, which may or may not be the Northern 
outcrop of the field. It is therefore probable that neither the 
Middle nor the Lower Coal Measures are represented in this area, 
unless there be some purely local peculiarity of the field in this 
neighbourhood. The beds at Burford much further South, pro- 
vided they belong to the same field, will thus prove to belong 
to the same, or to an even higher horizon than at Batsford. 
I come now to a comparison with the results which have 
recently been obtained in the coalfields which lie to the West and 
Northwest of the Oxfordshire field. A line joming Burford and 
Batsford, and produced northwards, would run in the concealed 
ground between the South Staffordshire and Warwickshire coal- 
fields. With these areas however there is no real comparison. 
It is true that, i both fields, red-grey measures belonging to the 
Transition Series occur, but these are underlain by productive 
Middle Coal Measures, which appear to be entirely wanting in 
the Oxfordshire field. These three fields however agree in the 
absence of Lower Coal Measures, and in the fact that the measures 
rest directly on Silurian rocks in South Staffordshire and Oxford- 
shire, though on Cambrian in Warwickshire. 
With the most southerly of the coalfields of the Welsh 
