wpe 2 Articles. 
ON SOME LYCOPODIACEOUS PLANTS FROM THE OLD 
RED SANDSTONE OF THE NORTH OF SCOTLAND. 
By Wm. Carrvuruers, F.R.S. 
(Prare 137.) 
Tux precise horizon which should separate the Carboniferous 
formation from the Devonian is a subject which has been often dis- 
? 
d in this way Unger, van dppert, and Schimper have appa- 
ie ere increased the n 8. 
On the other hand, the Dabo Prof. Jukes proposed to exclude the 
the Old Red Sandston 
Devonians of the South of England from stone 
series, and to consider them as only the equivalents of the lower Car- 
boniferous strata of the South of Ireland. And Prof. Heer has gone 
further, for while Jukes held that the yellow sandstones formed 
newest beds of the Old Red Sandstone, he has proposed to un unite these 
series of the Carboniferous period The animal remain send: in some 
of the beds * ie yellow sandstones, ho ja establish ‘that these beds 
e of Devonian age, and bi is, besides, nothing in the facies of 
the fossil 868 found in them to require e their being associated with 
the Carboniferous system 
From the Devonian ‘system then I understand to be oxeess 
the so-called transition rocks of the Continent, of which the most 
characteristic fossil is Posidonomya, and to be included the yellow sand- 
stones of Ireland and Scotland, and the rocks containing similar fossils 
in Devonshire. se re o the Devonian rocks propery a nm: con- 
; a 3 
mu 
Ae 
ae 
: ay 
*O 
pu 
o 
<a 
r=] 
Roemer in 
graphica 1854, vol. iii.) ; by the Sandberge 
graphic of Nassau aa by Dag in vat a Schifer " Sandstein. 
F fe " ay ty chrift. . Vienn, vol. xi,, 
Beaks of the Verges (1862) ; 
Flora of the Older Hocks 
N.S. VOL. 2. [NovEMBER, 1873 Y 
