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The tip is complete but has filling of natural fractures
increases rapidly in thickness to the southwest
This formation is interpreted as a semiarid environment with distinct wet and dry seasons
There is also the impression of a reed
the core of the ball is about 1 cm in diameter and is covered with a net of mesh 1 mm
Eocene Green River Undescribed Birthwort P-PCM-16-062 Eocene The tip is complete butUndescribed 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
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