bluegilldvm Posted December 6, 2020 Share Posted December 6, 2020 This was collected at a private recreation club west of Pit 11 from old spoil hills. I have found Listracanthus spines from this type of black shale. I’m not sure if this is a large spine or something else. Thanks 1 Link to comment Share on other sites More sharing options...
bluegilldvm Posted December 8, 2020 Author Share Posted December 8, 2020 (edited) This is a repost from yesterday and I'm hoping to get some responses today. This was collected in Pit 14 (west of Pit 11) on the surface of old spoil mounds. I have found listracanthus spines from this area. Any ideas what this could be? Thanks Edited December 8, 2020 by bluegilldvm Link to comment Share on other sites More sharing options...
Huntonia Posted December 8, 2020 Share Posted December 8, 2020 Patience is important when it comes to IDing fossils. At times it takes days or weeks to get the right pair of eyes on a certain piece, especially something partial like this. As such we ask you avoid making duplicate posts. A moderator will likely combine your threads soon As far as the actual fossil goes, @connorp may have some insight. 1 Link to comment Share on other sites More sharing options...
RCFossils Posted December 8, 2020 Share Posted December 8, 2020 It appears to be a partially exposed/preserved arthropod named Concavicaris sinuata. They are fairly abundant in certain sections of Illinois black shale. Concavicaris is a Thylacocephalan. They are very unusual bivalved arthropod with huge eyes and raptorial appendages. Your specimen appears to preserve the anterior end of the animal including a portion of the optic notch. Here is a more complete example for comparison. 7 Link to comment Share on other sites More sharing options...
connorp Posted December 8, 2020 Share Posted December 8, 2020 Yes, probably Concavicaris. Also, I believe the shale from Pit 14 is the Excello Shale. Slightly younger than the Mazon Creek deposits. 5 Link to comment Share on other sites More sharing options...
bluegilldvm Posted December 8, 2020 Author Share Posted December 8, 2020 10 hours ago, Huntonia said: Patience is important when it comes to IDing fossils. At times it takes days or weeks to get the right pair of eyes on a certain piece, especially something partial like this. As such we ask you avoid making duplicate posts. A moderator will likely combine your threads soon As far as the actual fossil goes, @connorp may have some insight. Sorry @Huntonia. My lack of patience got the better of me. 1 Link to comment Share on other sites More sharing options...
bluegilldvm Posted December 8, 2020 Author Share Posted December 8, 2020 9 hours ago, RCFossils said: It appears to be a partially exposed/preserved arthropod named Concavicaris sinuata. They are fairly abundant in certain sections of Illinois black shale. Concavicaris is a Thylacocephalan. They are very unusual bivalved arthropod with huge eyes and raptorial appendages. Your specimen appears to preserve the anterior end of the animal including a portion of the optic notch. Here is a more complete example for comparison. Thanks @RCFossils -- I appreciate the ID and information on the species. Link to comment Share on other sites More sharing options...
bluegilldvm Posted December 8, 2020 Author Share Posted December 8, 2020 9 hours ago, connorp said: Yes, probably Concavicaris. Also, I believe the shale from Pit 14 is the Excello Shale. Slightly younger than the Mazon Creek deposits. Thanks @connorp -- I appreciate the information. Link to comment Share on other sites More sharing options...
Huntonia Posted December 8, 2020 Share Posted December 8, 2020 8 hours ago, bluegilldvm said: Sorry @Huntonia. My lack of patience got the better of me. No worries, glad you got your answer. That's quite an interesting one Link to comment Share on other sites More sharing options...
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