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| | Pennsylvania State Fossil: Trilobite (Phacops rana) |
 | | States Symbols Almanac Economy Facts First Inhabitants History Geography People Presidents Timelines |
 | | Trilobites were found on necklaces belonging to the prehistoric inhabitants of 15,000 year old rock shelters of Europe. |
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| www.e-referencedesk.com /resources/state-fossil/pennsylvania.html (710 words) |
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