198 Proceedings of the Royal Physical Society. 
In regard to the note referring to the union of the Yore- 
dale Beds and the Mountain Limestone, under the name of 
the “Carboniferous Limestone Series,” it seems to be a 
retrograde movement in nomenclature. 
I presume that there is a general consensus of opinion that 
the Yoredale Beds, or the upper portion of them at least, 
are the equivalent of the Carboniferous Limestone Series of 
Scotland. I have seen no fossil plants from the Yoredale Beds, 
and therefore offer no opinion on their relationship to the 
Carboniferous Limestone Series of Scotland,—my knowledge 
of the series being entirely gained from-written descriptions. 
But this is known, that the Yoredale Beds overlie the 
Mountain Limestone of England, and, further, it is also 
known, that the Mountain Limestone of England is the 
equivalent of the Calciferous Sandstone Series of Scotland ;* 
therefore the probability is, that the Yoredale Beds are the 
equivalents, in whole or in part, of the Carboniferous Lime- 
stone Series of Scotland. That being the case, I do not 
think they should be classed as merely an upper portion of 
the Mountain Limestone of England. If the position of 
these Yoredale Beds is doubtful, so much greater is the 
necessity of retaining them under their old name. Their 
very union with the Mountain Limestone under one name is 
against the Committee’s own suggestion as to the advisability 
of using “local subdivisions.” In any case, the note as given 
to Mr Peach’s sketch section, would lead one to infer that the 
writer of the note accepted the position given to the Yore- 
dales by Mr Peach, but then said that the Carboniferous 
Limestone Series of Scotland and the Calciferous Sandstone 
Series of Scotland should unitedly be regarded as the 
equivalents of their Carboniferous Limestone Series (of 
England), which comprises the Yoredale Rocks and the 
Mountain Limestone. - 
This is working backwards. There is no doubt that the 
Carboniferous Limestone Series and the Calciferous Sandstone 
Series of Scotland form two well-defined series, and that the 
1 Goodchild, Note on the Carboniferous Conglomerates of the Eastern 
Part of the Basin of the Eden—Quart. Jour. Geol. Soc., vol. xxx., 1874, 
p. 394. 
