hobbitfeet Posted September 30, 2017 Share Posted September 30, 2017 I found this first recently went to near Eureka. To me is looks like a Ceraurus right genal spine. This second one group I bought at an fossil estate sale and it says unknown echinoderms Ralls county MO. 1 Link to comment Share on other sites More sharing options...
hobbitfeet Posted September 30, 2017 Author Share Posted September 30, 2017 I don't have a clue what this big dark thing is near a cephalopod that is missing some chambers. Link to comment Share on other sites More sharing options...
hobbitfeet Posted September 30, 2017 Author Share Posted September 30, 2017 On Highway MM I've found a number of these trilobite heads, this is the largest but I don't what it is. Does anyone know of a good resource for fossil IDing in Eastern Missouri? Link to comment Share on other sites More sharing options...
Douvilleiceras Posted September 30, 2017 Share Posted September 30, 2017 21 minutes ago, hobbitfeet said: I found this first recently went to near Eureka. To me is looks like a Ceraurus right genal spine. This is a Cheirurid librigena, or free cheek, not solely a genal spine. It looks to be mostly complete - nice find! Regards, Jason "Trilobites survived for a total of three hundred million years, almost the whole duration of the Palaeozoic era: who are we johnny-come-latelies to label them as either ‘primitive’ or ‘unsuccessful’? Men have so far survived half a per cent as long." - Richard Fortey, Trilobite: Eyewitness to Evolution. Link to comment Share on other sites More sharing options...
ashcraft Posted October 1, 2017 Share Posted October 1, 2017 When I see dark things in limestone in Eastern Missouri, I start contemplating teeth. Brent Ashcraft ashcraft, brent allen Link to comment Share on other sites More sharing options...
Monica Posted October 1, 2017 Share Posted October 1, 2017 Hi @hobbitfeet! Is that a loose blastoid that I see in your echinoderm pictures?! If it is indeed a blastoid, and it is indeed from Missouri as the label in the box states, perhaps it could be a Globoblastus sp.? I just did a quick google search and that genus popped up and I think that it resembles what you have... Nice acquisitions, and nice trilobite bits! Monica 2 Link to comment Share on other sites More sharing options...
piranha Posted October 1, 2017 Share Posted October 1, 2017 23 hours ago, hobbitfeet said: On Highway MM I've found a number of these trilobite heads, this is the largest but I don't what it is. The glabellar lobes and wide occipital ring are key features of a pterygometopid. A good match also found in eastern Missouri is: Eomonorachus intermedius figure from: Ludvigsen, R. & Chatterton, B.D.E. (1982) Ordovician Pterygometopidae (Trilobita) of North America. Canadian Journal of Earth Sciences, 19(11):2179-2206 PDF LINK 2 Link to comment Share on other sites More sharing options...
hobbitfeet Posted October 2, 2017 Author Share Posted October 2, 2017 15 hours ago, Monica said: Hi @hobbitfeet! Is that a loose blastoid that I see in your echinoderm pictures?! If it is indeed a blastoid, and it is indeed from Missouri as the label in the box states, perhaps it could be a Globoblastus sp.? I just did a quick google search and that genus popped up and I think that it resembles what you have... Nice acquisitions, and nice trilobite bits! Monica I also bought a box labeled cryptoblastus so it might be one that got misplaced for the sale. Link to comment Share on other sites More sharing options...
pefty Posted September 15, 2020 Share Posted September 15, 2020 Any update on that dark chunk? A fish find in the Ordovician would be significant, but I'm wondering what else it might be. (This is Asa btw ) Link to comment Share on other sites More sharing options...
pefty Posted May 17, 2023 Share Posted May 17, 2023 Derek, I'm currently working on a comprehensive guide to the trilo-bits of the Decorah Group, starting with drawings but will be adding photos too. Here's the work in progress, just a holding pen for drawings I've gathered so far: https://docs.google.com/presentation/d/1UgxtwabIUxj09IbUly_kNAdCMmpA7oW-Rtzt1ZwmR5s/edit?usp=sharing 1 Link to comment Share on other sites More sharing options...
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