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The sphere is 8 cm in diameter
This formation is interpreted as a semiarid environment with distinct wet and dry seasons
The holotype
The second oil-shale interval is located in the upper 10 m of the Parachute Creek Member
Eocene Green River Undescribed Birthwort P-PCM-16-062 Eocene The sphere is 8 cmUndescribed Birthwort Green River Formation Middle Eocene Lincoln County, Wyoming This fine example is interpreted to be an undescribed Birthwort leaf possible from the family Aristolochiaceae. This specimen is a complete leaf but is folded. Birthworts (also known as pipevine or Dutchman's pipe) are perennial herbaceous plants, shrubs, and vines. There are about 400 living specie today. These plant leaves are rare in the Green River Formation. This