Knightia Eocaena Fish Green River Formation Wyoming Display Case For Sale
Green River Formation Fossil Fish
The Green River Formation is an Eocene geologic formation that records the sedimentation in a group of intermountain lakes. The sediments are deposited in very fine layers, a dark layer during the growing season and a light-hue inorganic layer in winter. Each pair of layers is called a varve and represents one year. The sediments of the Green River Formation present a continuous record of six million years. The mean thickness of a varve here is 0.18mm, with a minimum thickness of 0.014mm and maximum of 9.8mm.
The sedimentary layers were formed in a large area named for the present-day Green River, a tributary of the Colorado River. The area of the formation exists as three separate basins around the Uinta Mountains of northEastern Utah: an area in northwestern Colorado east of the Uintas, a larger area in the southwest corner of Wyoming just north of the Uintas known as Lake Gosiute, the largest area, in northEastern Utah and western Colorado south of the Uintas, known as Lake Uinta.
Fossil Butte National Monument in Lincoln County, Wyoming is in a part of the formation known as Fossil Lake because of its abundance of exceptionally well preserved fish fossils.
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Knightia Eocaena Fish Green River Formation Wyoming Display Case: $8