Bradley, Dwight C, <br/><br/>
U-Pb geochronology and tectonic implications of a silurian ash in the Farewell terrane, Alaska / 
At head of title:  Studies by the U.S. Geological Survey in Alaska, volume 15  Uranium lead geochronology and tectonic implications of a silurian ash in the Farewell terrane, Alaska 
by Dwight C. Bradley, Julie A. Dumoulin, and Dan B. Bradley. 
 - 1 online resource (iii, 12 pages) :  color illustrations, color maps. 
 - Professional paper ;  1814-F .
 - U.S. Geological Survey professional paper ;  1814-F. .
<br/><br/> CRDP Program record. 
<br/><br/>Includes bibliographical references (pages 10-12). 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Volcanic ash, tuff, etc.--Alaska.<br/>Paleontology--Silurian.<br/>Geological time.<br/>Uranium-lead dating.
<br/><br/><label>GPO Item No.: </label>0624 (online) 
<br/><br/><label>Gov. Doc. Class. No.: </label>I 19.16:1814 F