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Leaf

Image Not Available

Leaf

Geography: USA, Colorado
Date: 1981
Dimensions:
length of slab=22; width of slab=13 cm
Taxonomy
    • Attributes
    • Objects
    • Taxonomy
    • KingdomPlantae
    • PhylumAngiospermophyta
    • GenusPlatanus
    • SpecificEpithetsp.
Object number: 41776
Not on view
DescriptionAlthough past life was diverse, we rarely have a good window through which to examine it. The Green River Formation is one such window with its spectacular preservation of diverse fish, insects, and plants, and other animals. Here, we can view Wyoming during the Eocene, much as it was about 50 million years ago. The deposits represent a series of freshwater lakes. Algal blooms occasionally depleted the oxygen of one of the lakes, suddenly suffocating the fish. The dead fish (and occasionally other animals) sank and were covered by sediment that precipitated from the water due to the sudden change in water chemistry, Over the millennia, repeated blooms in one lake or another of this system created a buildup of abundant layers of thick, fossil-rich limestones. The collections of plant remains from the Green River Formation indicate that overall the region was seasonally dry and had a subtropical to warm temperate climate. Local conditions, such as elevation, also can also influence the kinds of plants that are present; the Green River fauna not only includes palms, but also more temperate plants such as willows, poplars and this plane tree.
Collection:
Palaeobotany
Browse Categories:Fossils
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