Eocene Green River Undescribed Birthwort P-GRP2-16-013Undescribed Birthwort Green River Formation Middle Eocene Lincoln County, Wyoming This extraordinary example is interpreted to be an undescribed Birthwort leaf possible from the family Aristolochiaceae. 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 specimen is from the 18 inch layer. The
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Eocene Green River Undescribed Birthwort P-GRP2-16-013