What era the rocks are from and how old the fossils are

Reference no: EM131237581

While on a nature hike, you come upon a rock quarry whose shale rock contains fossils of crinoids, brachiopods, and trilobites. Your companion asks you what era the rocks are from and how old the fossils are. In light of this assemblage of fossils, what are your answers?

Reference no: EM131237581

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