kerouac22 Posted January 1, 2016 Share Posted January 1, 2016 Hey guys, This is my first and only trilobite, which I found earlier this year in a creek bed in Missouri. The rocks in that area are predominately Mississippian or Pennsylvanian, but this particular creek seems older, maybe Devonian. I'm new to all this, so take all that with a grain of salt. So what do you all think? Link to comment Share on other sites More sharing options...
kerouac22 Posted January 1, 2016 Author Share Posted January 1, 2016 And here's a scale reference. I should mention that I found it weathered out of the rock already, just as you see it here (no prep). Thanks! Link to comment Share on other sites More sharing options...
Slowpoker Posted January 1, 2016 Share Posted January 1, 2016 Hmm... I'll take a blind stab and say Phacops, though I am very likely to be wrong. Link to comment Share on other sites More sharing options...
howard_l Posted January 1, 2016 Share Posted January 1, 2016 I am guessing Carboniferous, maybe Pennsylvanian. All the trilobites I have found including Mississippian, I have never found a Pennsylvanian one. Howard_L http://triloman.wix.com/kentucky-fossils Link to comment Share on other sites More sharing options...
howard_l Posted January 1, 2016 Share Posted January 1, 2016 Are there other fossils there, that might help in determining the age. Howard_L http://triloman.wix.com/kentucky-fossils Link to comment Share on other sites More sharing options...
piranha Posted January 1, 2016 Share Posted January 1, 2016 It's definitely not a phacopid. This lower Mississippian phillipsiid trilobite is a good match with: Comptonaspis swallowi 1 Link to comment Share on other sites More sharing options...
piranha Posted January 1, 2016 Share Posted January 1, 2016 Some good references: Brezinski, D.K. (1986) Trilobite associations from the Chouteau Formation (Kinderhookian) of central Missouri. Journal of Paleontology, 60(4):870-881 Brezinski, D.K. (1988) Revision and redescription of some Lower Mississippian trilobites from the Chouteau Formation (Kinderhookian) of central Missouri. Journal of Paleontology, 62(1):103-110 Brezinski, D.K. (2000) New Lower Mississippian trilobites from the Chouteau Group of Missouri. Annals of Carnegie Museum, 69(2):135-144 1 Link to comment Share on other sites More sharing options...
kerouac22 Posted January 1, 2016 Author Share Posted January 1, 2016 It's definitely not a phacopid. This lower Mississippian phillipsiid trilobite is a good match with: Comptonaspis swallowi IMG1.jpg Some good references: Brezinski, D.K. (1986) Trilobite associations from the Chouteau Formation (Kinderhookian) of central Missouri. Journal of Paleontology, 60(4):870-881 Brezinski, D.K. (1988) Revision and redescription of some Lower Mississippian trilobites from the Chouteau Formation (Kinderhookian) of central Missouri. Journal of Paleontology, 62(1):103-110 Brezinski, D.K. (2000) New Lower Mississippian trilobites from the Chouteau Group of Missouri. Annals of Carnegie Museum, 69(2):135-144 Looks like you're onto something there. The glabellas, in particular, are very similar. Thanks, and thanks for the references as well. Link to comment Share on other sites More sharing options...
kerouac22 Posted January 1, 2016 Author Share Posted January 1, 2016 Are there other fossils there, that might help in determining the age. Here's an image of a couple types of weather-worn brachiopods I find around there. The type on the right is much more abundant than the other. Link to comment Share on other sites More sharing options...
Slowpoker Posted January 1, 2016 Share Posted January 1, 2016 It's definitely not a phacopid. This lower Mississippian phillipsiid trilobite is a good match with: Comptonaspis swallowi IMG1.jpg Ah yes, I knew it would not be, Excuse my incompetence, I'm not good at Identifying anything other than dinosaur or marine reptiles, just wanted to help out. Good luck nevertheless! Link to comment Share on other sites More sharing options...
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