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![](./images/clear.gif) 1.- HETTANGIAN AND SINEMURIAN AMMONOID ZONATION FOR THE WESTERN CORDILLERA OF NORTH AMERICA
SOCIETE VAUDOISE DES SCIENCES NATURELLES; LAUSANNE; CHE; SWITZERLAND, 2001
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![](./images/clear.gif) 2.- SINEMURIAN (EARLY JURASSIC) AMMONITES FROM THE ANTIMONIO FORMATION, SONORA, MEXICO
GEOLOGICAL SOCIETY OF AMERICA (GSA); BOULDER, CO; USA; UNITED STATES, 1996
GEOLOGICAL SOCIETY OF AMERICA, CORDILLERAN SECTION, 92ND ANNUAL MEETING
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![](./images/clear.gif) 3.- THE ANTIMONIO FORMATION IN SONORA, MEXICO, AND THE TRIASSIC-JURASSIC BOUNDARY
NATIONAL RESEARCH COUNCIL OF CANADA; OTTAWA, ON; CAN; CANADA, 1996
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