portage-group
Por"tage group`. Etym: [So called from the township of Portage in New York.] (Geol.) Defn: A subdivision of the Chemung period in American geology. See Chart of Geology.
Por"tage group`. Etym: [So called from the township of Portage in New York.] (Geol.) Defn: A subdivision of the Chemung period in American geology. See Chart of Geology.