L., Lesquereux—Land Plants of the Lower Silurian. 38 
in the Lower Silurian, the lower part of the Cincinnati group 
being the equivalent of the Trenton group of New York * 
account of the presence of this species of Favosites, Murchinson 
mitted these strata to be Lower Devonian. me : 
With the exception of the Lebanon specimen, the geological 
* The occurrence of vegetable remains in clay beds abounding in remains of Tri- 
—— is not subject to obfeetti. The Coubavilinsie of the West have strata of 
sg ; clay, limestone, even sandstone, where animal and vegetable remains are 
py together in abundance. I have found Trilobites in the shale overlaying 
_beds at Summit Portage, Pennsylvania, with Sigillaria, Stigmaria, etc., and. 
tppen not the same kind of animals, with plants too, in sandy clay beds of the 
ned Coal-measures of Indiana. Ps cases 3 a 
home he the Devonian and Upper Silurian form of Canada, Pam- 
’ Pe. le sea % g “ pote A Sens 
¢ Flora ,silurischen, der Devonishen, ete., oder des sogenanten Usbergangs- 
AM. Jour. So1.—Tamp Serres, Von. VII, No. 37.—Jan., 1874, 
