PARK SHALE--Green micaceous soft shale.  Upper part may be Late Cambrian.  O_ 
MEAGHER LIMESTONE--Blue-gray and yellow mottled hard limestone.  O_
WOLSEY SHALE--Green micaceous soft shale.  O_
FLATHEAD SANDSTONE--Dull-red quartzitic sandstone. 
  Northern Yellowstone area.  O_
  North Wyoming.  O_, _r, Pzr