YELL. YELL-92017 (pictured here) and YELL-92024: Both the inarticulate (YELL-92017) and articulate brachiopods (YELL-92024) existed about 520 million years ago. The inarticulate was collected from the Park Shale, while the articulate brachiopod was collected on Mount Holmes from the Middle Cambrian Pilgrim Limestone within Yellowstone National Park. Collecting any natural resources, including rocks and fossils, is illegal in Yellowstone.

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Keywords: america, american, conservation, country, history, land, lands, national, natural, nature, np, park, parks, preserve, public, service, usa, widlife, wilderness, yellowstone