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OpenStudy (anonymous):

The Tapeats Sandstone and Bright Angel Shale contain fossils of trilobites, which were marine organisms similar to modern-day horseshoe crabs. The Muav and Redwall limestones contain a boneless fish fossil. The Supai Group and Hermit Shale contain a boned fish. The Cocino Sandstone and layers above contain an amphibian fossil. Which correctly orders these organisms, from oldest to youngest?

OpenStudy (anonymous):

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OpenStudy (anonymous):

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