Fossils, clues to the past  [motion picture] / 
National Geographic Society. 
 - Washington, D.C. :  National Geographic Society, Educational Services,  c1983. 
 - 1 film reel :  sd., col. ;  16 mm. 
<br/><br/> Intended audience: Grades 7-12 and adults.  Issued also as videorecording. 
<br/><br/> Dr. Donald C. Johanson discusses what a fossil is and some of the ways in which they are formed. He also discusses what fossils reveal and how scientists determine their age. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleontology.