• J^oU 1. — The name carboniferous limestone has been given to a por- 
tion of the rocks exhibited in the section: this name is intended to ap- 
ply not only to that particular part, but to all the rocks below as far as 
the sandstone. This will be seen in the description of the rocks. 
J^ote 2. — Through inadvertence, the quotation marks were omitted in 
Dr. Boyd's report of Wayne and Orleans counties. 
Erratum. — ^Map of geology of Genesee river, for 105 feet, read 85. 
