and Point Levi Fossils. 225 
Virginia but for the whole Appalachian chain; and the results 
were shown in numerous carefully worked sections. In 1848 
'44 and ’45 I had myself several times crossed from the Hudson 
River to the Green Mountains, and found little of importance to 
conflict with the views expressed by the professors Rogers in re- 
gard to the chain farther south, except in reference to the sand- 
stone of Burlington, and one or two other points, which I then 
regarded as of minor importance. . 
ir William Logan had been working in the investigations of 
the geology of Canada; and better work in physical geology 
oe 2 
lle of small trilobites undistinguishable from Conocephal 
Sandstone near Trempaleau, Wisconsin, on the Mississippi river. 
