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Fossil Impressions Darken with Oxidization

Credit: Lisa Rowell/morgueFile.com
article: Fossil Hunting at the Clarkia, Idaho Fossil Bowl 		Other images from this article
Plant Fossils Predominate Clarkia Beds Fossil Impressions Darken with Oxidization Fish Fossils Are Rare Finds
Fossil Impressions Darken with Oxidization, Lisa Rowell/morgueFile.com