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Age of the Morrsion



 Wanted age ranges for members within the Morrison Formation:
 
 -------------------- (     ) mya
  M |
  O | Brushy Basin Member
  R |
  R |---------------- (     )
  I |
  S | Saltwash Member
  O |
  N |---------------- (     )
    |
  F | Tidwell Member
  M |
 -------------------- (     )


Did I forget any members within the Morrison? If so, please list with ages
if known.


Thanks in Advance

---John Schneiderman (dino@revelation.unomaha.edu)