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<p>[QUOTE="Parthicus, post: 3097511, member: 81887"]The top trilobite is definitely Elrathia, and in Utah it is found in large numbers in the Wheeler Formation which dates to the Cambrian Period, c. 540-481.5 million years old. The Elrathia trilobite I posted earlier in this thread is from the Wheeler Formation. I am not as sure about the bottom trilobite, but it may also be Elrathia, with the free cheeks of the head missing. (Trilobites often broke up after death.)</p><p><br /></p><p>The fish is typical preservation for the Green River Formation. The most common types are Knightia and Diplomystus, I'm not sure how to tell the difference but the ID seems reasonable. For more opinions, I recommend joining The Fossil Forum at <a href="http://www.thefossilforum.com" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.thefossilforum.com" rel="nofollow">www.thefossilforum.com</a> , it's kind of similar to CoinTalk but for fossils.[/QUOTE]</p><p><br /></p>
[QUOTE="Parthicus, post: 3097511, member: 81887"]The top trilobite is definitely Elrathia, and in Utah it is found in large numbers in the Wheeler Formation which dates to the Cambrian Period, c. 540-481.5 million years old. The Elrathia trilobite I posted earlier in this thread is from the Wheeler Formation. I am not as sure about the bottom trilobite, but it may also be Elrathia, with the free cheeks of the head missing. (Trilobites often broke up after death.) The fish is typical preservation for the Green River Formation. The most common types are Knightia and Diplomystus, I'm not sure how to tell the difference but the ID seems reasonable. For more opinions, I recommend joining The Fossil Forum at [url="http://www.thefossilforum.com"]www.thefossilforum.com[/url] , it's kind of similar to CoinTalk but for fossils.[/QUOTE]
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