Brainerd, Ezra, 1844-1924.Seely, Henry Martyn, 1828-1917.2005-10-062005-10-061890http://hdl.handle.net/2246/84423 p. : ill., maps ; 24 cm.Includes bibliographical references.en-USQH1 .A4 vol.3, art.1, 1890Geology, Stratigraphic -- Ordovician -- Champlain Valley.Geology, Stratigraphic -- Ordovician -- New York (State)Geology, Stratigraphic -- Ordovician -- Vermont.Geology -- Champlain Valley.Geology -- New York (State)Geology -- Vermont.text