Bev Posted September 27, 2013 Share Posted September 27, 2013 (edited) Ordovician. Prosser member of the Galena Formation. SE MN where I have been picking up all those Flexicalymene sp. trilobite parts. Rock front 1 Rock back 2 I believe this is a Flexicalymene sp. trilobite because I can count at least 10 segments from the thorax. 3 Another angle 4 Then there is this on the back. Which one looks like a brach and the other ??? 5 There is a lot going on in this rock. Obviously, I've been digging around on it and some mud popped off and that is how I found the pygidium - buried. But what do you think of this "horseshoe"? 6 7 Horseshoe on edge. 8 Bottom of horseshoe kind of looks like a shell. And then there is this bump... 9 Besides a whole lot of other things going on in this rock! Actually, pretty amazing because I had just thrown it to the side as all brachs. Enlighten me if you would please! I have a lot to learn! Thanks for looking! Bev :-D Edited September 28, 2013 by Bev The more I learn, I realize the less I know. BluffCountryFossils.NET Fossil Adventure Blog Go to my Gallery for images of Fossil Jewelry, Sculpture & Crafts Pinned Posts: Beginner's Guide to Fossil Hunting * Geologic Formation Maps Link to comment Share on other sites More sharing options...
jgcox Posted September 27, 2013 Share Posted September 27, 2013 The item over the brach is an isotealus hypostome (mouth parts) but the thoracic segments don't look right for a flexi. Link to comment Share on other sites More sharing options...
piranha Posted September 27, 2013 Share Posted September 27, 2013 It's a pygidium from a pterygometopid; Eomonorachus or similar. Link to comment Share on other sites More sharing options...
Bev Posted September 28, 2013 Author Share Posted September 28, 2013 Thank Guys! Any thoughts on the horseshoe or bump? The more I learn, I realize the less I know. BluffCountryFossils.NET Fossil Adventure Blog Go to my Gallery for images of Fossil Jewelry, Sculpture & Crafts Pinned Posts: Beginner's Guide to Fossil Hunting * Geologic Formation Maps Link to comment Share on other sites More sharing options...
Indy Posted September 28, 2013 Share Posted September 28, 2013 (edited) Any thoughts on the horseshoe ....? jgcox identified the horseshoe shape in reply #2 The hypostoma, or "mouth plate" of the Isotelus is a very recognizable (horseshoe shape) body part that is commonly found as the result of molting. For comparison click here web page: Link Not to suggest Isotelus maximus ... but link here for a visual comparison of an Isotelus sp. hypostoma. Edit When posting multiple pics ... It's helpful to number the pics to help members referencing their identifications and comments. Edited September 28, 2013 by Indy Flash from the Past (Show Us Your Fossils)MAPS Fossil Show Link to comment Share on other sites More sharing options...
Bev Posted September 28, 2013 Author Share Posted September 28, 2013 jgcox identified the horseshoe shape in reply #2 The hypostoma, or "mouth plate" of the Isotelus is a very recognizable (horseshoe shape) body part that is commonly found as the result of molting. For comparison click here web page: Link Not to suggest Isotelus maximus ... but link here for a visual comparison of an Isotelus sp. hypostoma. Edit When posting multiple pics ... It's helpful to number the pics to help members referencing their identifications and comments. When I am referring to the horseshoe, I am referring to photos 6, 7 & 8. Pic 5 appears to be the hypostome. And I'm clueless on photo #9. Thanks for the help Indy! The more I learn, I realize the less I know. BluffCountryFossils.NET Fossil Adventure Blog Go to my Gallery for images of Fossil Jewelry, Sculpture & Crafts Pinned Posts: Beginner's Guide to Fossil Hunting * Geologic Formation Maps Link to comment Share on other sites More sharing options...
Indy Posted September 28, 2013 Share Posted September 28, 2013 (edited) Thanks for adding numbers to the pictures Edited September 28, 2013 by Indy Flash from the Past (Show Us Your Fossils)MAPS Fossil Show Link to comment Share on other sites More sharing options...
Indy Posted September 28, 2013 Share Posted September 28, 2013 The curved trilobite fragment in photo 6 brings to mind an Isotelus genal spine. Flash from the Past (Show Us Your Fossils)MAPS Fossil Show Link to comment Share on other sites More sharing options...
erose Posted September 28, 2013 Share Posted September 28, 2013 I would be very interested in learning what species of Isotelus produced that hypostome. It has a somewhat different shape than the Isotellus maximus ones I know. Link to comment Share on other sites More sharing options...
piranha Posted September 28, 2013 Share Posted September 28, 2013 I would be very interested in learning what species of Isotelus produced that hypostome. It has a somewhat different shape than the Isotellus maximus ones I know. Looks very similar to this Galena Fm. Isotelus gigas hypostome posted by Caleb. Link to comment Share on other sites More sharing options...
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