Conodont faunas from the basinal deposits of the Permian near Las
  Delicias, Mexico, are dominated by shallow-water species of
  Hindeodus.  Three long-ranging Hindeodus zones, similar to those
  recognized in shallow-water deposits in much of the world, are H.
  excavatus, H. wordensis, and H. julfensis.  The conodonts indicate an
  age range for the Permian deposits from Sakmarian to Dzhulfian.  The
  conodonts and brachiopods are closely related to those from the
  Permian basin of West Texas.