The green river formation is formed due to accumulation of various types of sediments such as oolitic grainstones , packstones, oil shale, and mudstones.
- here Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles.
- oolitic grainstones consisting of multiple coatings of carbonate, usually calcite and/or aragonite, that precipitated on a nucleus; they are round and smooth, and form in shallow water depostitional environments.
- here packstones are porous sedimentary rocks.
- oil shale is the fine-grained sedimentary rocks composed of particles consisting of silica-containing minerals.
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