Description
Genuine Fossil Leaf from the Green River Formation
This genuine fossil leaf originates from the world-famous Green River Formation of the western United States, preserved in Eocene lake sediments from Utah or Wyoming. Dating to the Eocene epoch of the Paleogene Period, approximately 56–33.9 million years ago, this fossil represents part of the lush vegetation that once surrounded ancient freshwater lakes in what is now the Rocky Mountain region.
The specimen is a carefully selected fossil plant preserved within fine-grained sedimentary rock typical of the Green River Formation. The photographs show the exact fossil you will receive, allowing collectors to examine the natural leaf outline, venation patterns, and matrix preservation. Please refer to the photographs for the full sizing and proportions of the fossil. This specimen includes a Certificate of Authenticity lifetime guarantee generic card confirming that it is a genuine fossil.
About Fossil Leaves from the Green River Formation
Leaf fossils from the Green River Formation represent a wide variety of ancient plants that grew around large subtropical lakes during the Eocene epoch. These fossil plants provide valuable insight into the climate, vegetation, and ecosystems that existed in western North America during the early Cenozoic.
During the Eocene, the region supported dense forests and wetland environments containing a diverse mixture of flowering plants, palms, shrubs, and trees. Many fossil leaves from the Green River Formation belong to early angiosperms, the flowering plants that dominate modern terrestrial ecosystems.
The preserved leaf impressions often display remarkable detail, including midribs, branching veins, and sometimes fine secondary venation patterns. These features allow palaeobotanists to compare fossil leaves with modern plant groups and reconstruct ancient plant communities.
Leaf Morphology and Fossil Preservation
Fossil leaves from the Green River Formation are typically preserved as impressions or compressions within thin laminated limestone or shale. When a leaf fell into the lake water millions of years ago, it settled gently onto the lake floor where it was rapidly buried by extremely fine sediment.
Because the sediment accumulated in thin layers with minimal disturbance, delicate plant structures could be preserved with exceptional clarity. The resulting fossil often retains the full outline of the leaf, along with visible venation patterns that radiate from the central midrib toward the leaf margins.
These preserved details allow researchers and collectors to study the structure and diversity of ancient plant life from the Eocene period.
Geological Setting – The Green River Formation
The Green River Formation is one of the most famous fossil-bearing deposits in the world and is renowned for its exceptional preservation of plants, fish, insects, and other organisms. The formation was deposited in a system of large freshwater lakes that covered parts of present-day Utah, Wyoming, and Colorado during the Eocene epoch.
The sediments consist primarily of finely laminated limestone, oil shale, and mudstone deposited in calm lake environments. These lakes formed in intermontane basins created by tectonic activity associated with the uplift of the Rocky Mountains.
The slow accumulation of extremely fine sediment on the lake floor allowed delicate biological material to be preserved with extraordinary detail, making the Green River Formation one of the most important fossil Lagerstätten of the Cenozoic.
Eocene Climate and Ecosystem
During the Eocene epoch, global temperatures were significantly warmer than today. The region that is now Utah and Wyoming experienced a warm temperate to subtropical climate with abundant rainfall.
The lakes of the Green River Formation were surrounded by rich vegetation including broadleaf trees, shrubs, and aquatic plants. These ecosystems supported a diverse range of animals including fish, turtles, crocodilians, birds, insects, and early mammals.
Leaves falling from surrounding forests were frequently carried into the lakes where they sank and became buried in the fine sediment. These preserved plant remains provide important evidence of the vegetation and climate of Eocene North America.
Authenticity and Collectability
• Genuine fossil leaf from the Green River Formation
• Eocene epoch, approximately 56–33.9 million years old
• Collected from Utah or Wyoming, United States
• Classic fossil plant from one of the world’s most famous fossil deposits
• The fossil shown in the photographs is the exact specimen you will receive
• Includes a Certificate of Authenticity lifetime guarantee generic card
Green River fossil leaves are highly sought after by collectors due to their beautiful preservation and their connection to one of the most important fossil deposits in the world. This fossil leaf represents a fascinating glimpse into ancient Eocene forests and makes an excellent addition to any fossil collection, geological display, or natural history study.
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