Early Turonian ammonites from Vallecillo, north-eastern Mexico: ttaxonomy, biostratigraphy and palaeobiogeographical significance

C. Ifrim, and W. Stinnesbeck

2007

Article

Cretaceous Research 28:642-663

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Taxa discussed in this work:

• Pseudaspidoceras flexuosum
• Quitmaniceras reaseri
• Tragodesmoceras bassi
• Vascoceras birchbyi
• Watinoceras coloradoense

Taxonomy:

• Tragodesmoceras clypealoides belongs to Tragodesmoceras - Spath (1922)
• Tragodesmoceras bassi belongs to Tragodesmoceras - Ifrim and Stinnesbec (2007)
• Quitmaniceras reaseri belongs to Quitmaniceras - Ifrim and Stinnesbec (2007)
• Pseudaspidoceras pseudonodosoides belongs to Pseudaspidoceras - Ifrim and Stinnesbec (2007)
• Vascoceras birchbyi belongs to Vascoceras - Ifrim and Stinnesbec (2007)
• Fagesia superstes belongs to Fagesia - Ifrim and Stinnesbec (2007)
• Fagesia catinus belongs to Fagesia - Ifrim and Stinnesbec (2007)