01700oam 2200457 450 991070785800332120161214153533.0(CKB)5470000002467978(OCoLC)885121891(EXLCZ)99547000000246797820140802d1964 ua 0engurn||||||||||crirdacontenttxtrdacontentcrdamediacrrdacarrierThe Helderberg Group and the position of the Silurian-Devonian boundary in North America /by Jean M. BerdanWashington, D.C. :United States Department of the Interior, Geological Survey,1964.Washington, D.C. :Government Printing Office.1 online resource (iii, 19 pages) map, chartsGeological Survey bulletin ;1180-BTitle from title screen (viewed July 24, 2014).Additional title page description: "A historical summary including a review of pertinent literature."Includes bibliographical references (pages 18-19).Contributions to stratigraphic paleontologyGeology, StratigraphicDevonianGeology, StratigraphicSilurianGeology, StratigraphicGeology, StratigraphicBerdan Jean Milton1392710Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910707858003321The Helderberg Group and the position of the Silurian-Devonian boundary in North America3447867UNINA