ANKAREH FORMATION--Red and maroon shale and purple limestone.  J@nd, @ad
CHUGWATER FORMATION--Red siltstone and shale.  Alcova Limestone Member in upper
     middle part in north Wyoming.  Thin gypsum partings near base in north and northeast
     Wyoming.  J@nd, J@gc, @c, @cd, @Pcg
CHUGWATER GROUP OR FORMATION (SOUTH WYOMING)--Red shale and siltstone
     containing thin gypsum partings near base.  Group includes Popo Agie Formation (red
     shale and red, yellow, and purple siltstone; lenses of lime-pellet conglomerate), Crow
     Mountain Sandstone (red and gray, thick bedded), Alcova Limestone, and Red Peak
     Formation (red siltstone and shale).  Chugwater Formation includes as members all the
     units listed above.  @c, @Pcg, @Pjs, MzPz