A Geologic Time Scale 2004  [electronic resource]. / 
Edited by Felix M. Gradstein, James G. Ogg, Alan G. Smith. 
 - Cambridge :  The University Press,  2012 
 - 1 online resource (610 p.) 
<br/><br/>Includes bibliographic references and index 
<br/><br/><label>ISBN: </label>9780511536045 (ebook) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geological time.