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Fifty million years ago, a giant salt lake existed in northwestern Colorado. Leaves, feather-like seeds (upper right, above), and a diverse array of insects, such as the lacewing shown above, fell into the lake. Over the millennia, the tissues of these organisms became mineralized—only to be later dissolved away by groundwater. Now all that remain are the bleached outlines of where the minerals used to be. Truly a ghost of a fossil!
James Hagadorn, PhD
Tim & Kathryn Ryan Curator of Geology
Kristen A. MacKenzie, MS
Earth Sciences Collections Manager
Nicole Neu-Yagle, MS
Earth Sciences Assistant Collections Manager
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