Innocentx Posted April 20, 2018 Share Posted April 20, 2018 Trying to help an acquaintance out. Here is her self-collected fossil "It’s from Jasper county in Missouri, which is a mix of Mississippian and Pennsylvanian periods." "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
DPS Ammonite Posted April 20, 2018 Share Posted April 20, 2018 Looks like mold of encrusting bryozoan colony. Note many other molds (holes) in the rock which is probably carbonate or chert. 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Innocentx Posted April 20, 2018 Author Share Posted April 20, 2018 10 minutes ago, DPS Ammonite said: Looks like mold of encrustion bryozoan colony. I don't recognize this bryozoan. Might you identify please? Thanks much. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
DPS Ammonite Posted April 20, 2018 Share Posted April 20, 2018 Typo, should be "encrusting" bryozoan. I do not know species but the exterior impression (3rd photo) with regularly spaced bumps reminds me of bryozoan that I have seen. Photo above is Tabulipora sp. from eky.edu. My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Innocentx Posted April 20, 2018 Author Share Posted April 20, 2018 If I mentally subtract the carbonate/chert material then I would expect to see similar to what you have pictured above. For the most part, I do. What throws me off is that in your example above, the bumps appear to have formed on the outer surface of it, as it encrusted, not in the attachment zone. It would be great to discover it's identity. Could you help me with sources, that I might learn more? Thank you. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
DPS Ammonite Posted April 20, 2018 Share Posted April 20, 2018 To help identify it to the species is difficult (and beyond me) and requires one that has the internal structures present (yours is a mold) so that thin sections and peels can be made. The best thing to do is to find papers on the fossil bryozoan from that area using area formations as a search term. Take a look at Fruitbat's library: http://www.thefossilforum.com/index.php?/topic/14728-fruitbats-pdf-library-table-of-contents/ 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Innocentx Posted April 20, 2018 Author Share Posted April 20, 2018 45 minutes ago, DPS Ammonite said: http://www.thefossilforum.com/index.php?/topic/14728-fruitbats-pdf-library-table-of-contents/ WOW! Thanks for this, @DPS Ammonite. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
Innocentx Posted April 20, 2018 Author Share Posted April 20, 2018 Sorry but just to be clear, when you say this is a mold do you mean the carbonate/chert was deposited around (on top or over) the bryozoan at a later time? "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
DPS Ammonite Posted April 20, 2018 Share Posted April 20, 2018 The bryozoan was buried in sediment which later hardened. The bryozoan may have grown on hard ground. Then the bryozoan dissolved leaving an empty space, a mold. 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Innocentx Posted April 20, 2018 Author Share Posted April 20, 2018 I had never seen this type occurrence with bryozoans. Thank you very much. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
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