DescriptionFOSSIL LEAF COLLECTION
Green River Formation, Wyoming
Because of the slow and lengthy nature of the fossilization process, vegetable matter is rarely preserved in the fossil record, usually decaying long before it can have a chance to be preserved in rock. The superb deposits of the Green River Formation in south-western Wyoming are one of the few places where dead flora and fauna was buried quickly enough by a covering of silt-mud to preserve this softer material, but even in such advantageous conditions, thin delicate leaves often remain hidden between the sedimentary layers. Here is a collection of four excellent examples, each clear and crisp in outline and detail to the veins and stalks. The largest leaf in this collection measures 4 7/8 inches long on a 6½ x 5-inch matrix and the smallest, which appears to be a small example from the Cardiospermum coloradensis, or Balloon Vine, measures just under 2 inches long on a 3 x 2 1/8-inch matrix.
Condition report available upon request.
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