Margaret Skeels Stevens

• Further study of Castolon local fauna (early Miocene), Big Bend National Park, Texas
• New early Miocene formation and vertebrate local fauna, Big Bend National Park, Brewster County, Texas
• The ostecology and relationships of the Pliocene ground squirrel, Citellus dotti Hibbard, from the Ogallala formation of Beaver County, Oklahoma