Eocene Green River Undescribed Birthwort P-PCM-16-062 Eocene increases rapidly in thickness to

increases rapidly in thickness to the southwest

There is also the impression of a reed

dating to the Late Jurassic epoch (Kimmeridgian to Tithonian stages)

using a lot of newly found characters of referred Megalosaurus specimens

Its ancestors date back to the Eocene and its last descendants are known from the Pliocene

Eocene Green River Undescribed Birthwort P-PCM-16-062 Eocene increases rapidly in thickness toUndescribed 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