302 E. W. Claypole—Tree-like fossil plant, Glyptodendron. 
Art. XLVI.—On the occurrence of a Tree-like fossil plant, Glyp- 
todendron, in the Upper Silurian (Clinton) Rocks of Ohio; b 
Professor E. W. Cuaypour, B.A., B.Se. (London), of Anti- 
och College, Yellow Springs, Ohio. 
In the month of July, 1877, while on a geological excursion 
in company with one of my students, Mr. Leven Siler, in the 
vicinity of Eaton, in Preble County, Ohio, the latter picked up 
and banded me a slab bearing the impression'of a vegetable 
stem, which proved, on closer examination, to be that of a 
plant allied to Lepidodendron. As the beds in which we were 
working at the time lie at the very base of the “Clinton” of 
the Ohio Survey, and within a few feet of the break which 
marks the summit of the Cincinnati group of the Lower Silu- 
rian, the specimen immediately assumed unusual interest and 
importance ; no indisputable traces of land-plants having then 
come to light from so low an horizon in America, and no re- 
mains of arborescent vegetation being known with certainty from 
strata of so old a date in the New or Old World. 
The slab containing the impression was not taken out of the 
solid rock, but lay loose on the bank of Clinton limestone. 
This fact will naturally raise some question concerning its age 
in the mind of every geologist. Fortunately, however, we are 
not in this instance dependent upon such evidence. To any 
one practically familiar with the Clinton rocks as they crop out 
the Cincinnati uplift no doubt can arise. The stone 1s 
a piece of yellow, rough, encrinital limestone, considerably 
weathered, with the characteristic appearance of the Clinton at 
Eaton and here. Moreover, by the side of the impression there 
me imens. But further 
re Boe the fossil and its nearest allies among the Sigillarids 
and Lepidodendrids has induced me to place it by itself in a 
new genus, which seems to form a connecting link between some 
other paleozoic genera. I append the following description :— 
