Peto Lithos Posted April 22, 2019 Share Posted April 22, 2019 Many years ago I found this trilobite on Marble Mountain in California. It is roughly 1 cm across at it's narrowest and 2cm acrossat it's widest.. It is probably cambrian age without much detail preserved. I am unsure of what layer it came from exactly, as it was found loose as is. Any general ideas would be appreciated. 1 Link to comment Share on other sites More sharing options...
Peto Lithos Posted April 22, 2019 Author Share Posted April 22, 2019 1 Link to comment Share on other sites More sharing options...
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Brett Breakin' Rocks Posted April 23, 2019 Share Posted April 23, 2019 1 hour ago, Peto Lithos said: Many years ago I found this trilobite on Marble Mountain in California. It is roughly 1 cm across at it's narrowest and 2cm acrossat it's widest.. It is probably cambrian age without much detail preserved. I am unsure of what layer it came from exactly, as it was found loose as is. Any general ideas would be appreciated. Hi there, not sure you have enough to go on for an ID beyond Trilo-bits. That being said you may find this site helpful and informative. I've used it ever since I visited the site for the first time many many moons ago. http://inyo.coffeecup.com/site/latham/latham.html I will also say the majority of material I pulled out of that area was of the Genus Olenellus (which has since changed to Mesonacis (?)) .. acording to the aforementioned website. Cheers, Brett 5 Link to comment Share on other sites More sharing options...
piranha Posted April 23, 2019 Share Posted April 23, 2019 On 4/22/2019 at 5:43 PM, Brett Breakin' Rocks said: I will also say the majority of material I pulled out of that area was of the Genus Olenellus (which has since changed to Mesonacis (?)) .. acording to the aforementioned website. The website is referencing only one species, Olenellus is still a valid genus. Olenellus fremonti Walcott 1910 was reclassified Mesonacis fremonti by Resser 1928. It was later reclassified "Fremontia" by Raw 1936, and many authors have applied each of these various names over the years. Fortunately Lieberman 1999 sorted it all out. "Olenellus fremonti" and "Fremontia fremonti" are synonyms of Mesonacis fremonti. Lieberman, B.S. 1999 Systematic Revision of the Olenelloidea (Trilobita, Cambrian). Peabody Museum of Natural History, Yale University Bulletin, 45:1-150 PDF LINK 3 Link to comment Share on other sites More sharing options...
FossilDAWG Posted April 23, 2019 Share Posted April 23, 2019 Notwithstanding the useful update on the systematics of Mesonacis fremonti, I agree with Brett that there isn't anything in the photos that is enough to be diagnostic of any particular trilobite species. Don 1 Link to comment Share on other sites More sharing options...
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