Eocene Green River Winged Fruit P-GRP2-16-016 Eocene The Green River Formation is

The Green River Formation is the remnant of a large lake whose mud would eventually be transformed into soft calcite-bearing shale

The Mazon Creek area fossils are found mostly in siderite concretions

and it consists mainly of filled natural fractures

between about 154 and 152 million years ago

Eocene Green River Winged Fruit P-GRP2-16-016 Eocene The Green River Formation is(?)Lagokarpos lacustris Green River Formation Middle Eocene Lincoln County, Wyoming This is a good example of a winged fruit of unknown family and order relationship. The venation in the winged portion is not preserved but it has a detailed globose fruit body. These are found in the 18 inch layer but are not common.