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Trilobite, Ammonoid, Unknown


collector

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I found my largest trilobite so far at 2 1/2 ". I am guessing that it is a Phacops. It was found by a creek and is worn but made me happy. By it was another rock that is very busy with some parts that remind me of a trilobite. I don't know if anyone can tell me what if anything I am looking at. The rock is 3" x 2 1/4". There does appear to be a brachiopod on one side. The third is an ammonoid found by Hemlock Lake and I wondered if it could be identified. It is ~ 1 3/4" at the widest point. The lake side is in the Sonyea group but It could have come down from higher up above the lake which gets into the upper Devonian.

Thank you for looking.

Patti

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Your right, the trilobite is an Eldredgeops (Phacops) rana and the Ammonoid is a Manticoceras species. The Sonyea group is Upper Devonian and its part of the Naples fauna that Clarke worked on and wrote about.

mikey

Many times I've wondered how much there is to know.  
led zeppelin

 

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That is a really nice find, Patti. I would be happy (actually elated) too to find one that size.

Gary

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That's a nice Manticoceras, I'd have been happy to find that one! It's too bad you didn't get that Phacops (actually, now Elredgeops) sooner, but it is a nice size for sure. The top right photo is likely a brachiopod, though there's not enough showing to positively identify. The other 3 photos show examples of "hackle fractures", a type of cleavage typical of some very fine grained rock. Sometimes this fracture pattern can look much like trilobite thoracic segments, but it's not actually a fossil.

Don

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Thank you gturner33 and FossilDAWG. I am happy with those guys but I have to admit that my husband found the Manticoceras. Also thanks for the explanation for the unknown. It's a very busy looking rock and with the brachiopod in it I figured maybe all of that spiny stuff was something and it is, hackle fractures. :D

Patti

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