Zanazzi, Alessandro <br/><br/>
Large temperature drop across the Eocene-Oligocene transition in central North America.  [electronic resource] 

 -  Nature  Feb 2007 
 - 639-42 p.  digital 
<br/><br/> Publication Type: Historical Article; Journal Article; Research Support, U.S. Gov't, Non-P.H.S. 
<br/><br/><label>ISSN: </label>1476-4687 
<br/><br/><label>Standard No.: </label>10.1038/nature05551  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Animals<br/>Atmosphere--chemistry<br/>Biodiversity<br/>Carbon Dioxide--analysis<br/>Carbon Isotopes<br/>Cold Climate<br/>Cold Temperature<br/>Dental Enamel--chemistry<br/>Fossils<br/>History, Ancient<br/>North America<br/>Oxygen Isotopes<br/>Seasons<br/>Seawater--analysis<br/>Time Factors