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Red Hill Fragment - Fish Part Or Shell?


hitekmastr

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1. Any ideas what this Red Hill fragment might be?

I just discovered this in the red shale from our Red Hill trip in June. This is an odd but well defined fragment from the 361 million year old Devonian site where tetrapods crawled onto land - not sure if this is shell material or part of a Devonian fish - about 1 cm - any ideas?

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2. Is this a trilobite or shell? (Devonian/Mahantango/Juniata County PA) - about 5cm long:

post-8709-0-18659800-1348372107_thumb.jpg

3. I previously posted this but since found this oblong shell in a reference book - believe it is the bivalve Nuculites - I identified this bivalve after posting - this oblong shell is about 2 cm and retains some of its striking iridescence - from Tully NY (windom/moscow formation):

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