González León, Carlos M. <br/><br/>
Ammonoid discoveries in the Antimonio Formation, Sonora, Mexico: new constraints on the Triassic-Jurassic boundary 

 - Oxford  Elsevier Science  November 2000 
 - pp. 491-497  ilus. 
<br/><br/><label>ISSN: </label>0895-9811 
<br/><br/><label>Subjects--Topical Terms: </label><br/>AMMONOIDEA<br/>JURASICO<br/>TRIASICO
<br/><br/><label>Subjects--Geographic Terms: </label><br/>MEXICO<br/>SONORA
<br/><br/><label>Subjects--Index Terms: </label>FORMACION ANTIMONIO