Eocene Green River Bursera P-GRP2-16-028Bursera inaequalateralis Green River Formation Middle Eocene Lincoln County, Wyoming This is beautiful example of Bursera. It has distinctive venation and a semi serrate margin. The leaf is 14 cm long and very attractive. It is from the 18 inch layer. Bursera, named after the Danish botanist Joachim Burser (1583 1639), is a genus with about 100 described species [2] of flowering shrubs and trees varying in size up to 25 m (82 ft) high. They are native