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In addition to its well-preserved fossil fish, the Green River Formation is famous for its trona and oil shale.
There is a zone nearly half of which consists of granular aggregates of trona and natron with numerous inclusions of pale pink prismatic crystals of shomiokite- reaching 15 cm long and 8 cm in diameter.
Most of the sodium carbonate used in North America comes from large deposits of the mineral trona , a sodium carbonate/bicarbonate found in Wyoming.
In alkaline lakes, natron and trona are found in the United States, Africa, and South America.
Another large producer of soda ash, the Corporation, also relies on trona to manufacture soda ash and sodium bicarbonate.
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