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Turonian ammonites from the Upper Cretaceous Carlile, Semilla Sandstone and Juana Lopez members of the Mancos Shale, Rio Puerco Valley, Sandoval County, New Mexico



Turonian ammonites from the Upper Cretaceous Carlile, Semilla Sandstone and Juana Lopez members of the Mancos Shale, Rio Puerco Valley, Sandoval County, New Mexico



Bulletin - New Mexico Museum of Natural History and Science 16: 137-143



Two ammonite zones are present in the upper part of the Carlile, Semilla Sandstone and Juana Lopez members of the Mancos Shale, in the Rio Puerco Valley northwest of Albuquerque, New Mexico. The Prionocyclus hyatti Zone is present in the Semilla Sandstone and upper Carlile members, so these units are of late--middle Turonian age. The Prionocyclus macombi Zone is present at the base of the Juana Lopez Member of the Mancos Shale and just below that member, so this interval is of early--late Turonian age. Two subzones of the P. hyatti Zone, each from a distinct stratigraphic horizon, are present. The lowest subzone of the P. hyatti Zone, the Hoplitoides sandovalensis Subzone, contains numerous Spathites puercoensis in small limestone septaria, but no specimens of H. sandovalensis or Herrickiceras costatum were collected. Coilopoceras springeri is abundant in the C. springeri Subzone of the P. hyatti Zone in very large limestone concretions at the base of the Semilla Sandstone Member. Romaniceras (Romaniceras) mexicanum and P. hyatti were collected from septarian nodules in the upper Carlile Member above the limestone concretion layer containing C. springeri. Two specimens of Placenticeras cumminsi were collected from the P. hyatti Zone. P. macombi is locally abundant at the base of the Juana Lopez Member in the P. macombi Zone, and one specimen of Coilopoceras collett was collected from this interval. Also from the same area, one specimen of Coilopoceras inflatum was collected from the P. macombi Zone, just below the Juana Lopez Member, but above the subzone containing R. mexicanum.

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Related references

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