MPH Posted August 17, 2020 Share Posted August 17, 2020 Sponge? Stromatolite? Link to comment Share on other sites More sharing options...
Pumpkinhead Posted August 17, 2020 Share Posted August 17, 2020 location? Link to comment Share on other sites More sharing options...
MPH Posted August 17, 2020 Author Share Posted August 17, 2020 Glacial till. West Central Indiana. been doing a bit more research on this....perhaps prasopora bryozoa? Link to comment Share on other sites More sharing options...
Rockwood Posted August 17, 2020 Share Posted August 17, 2020 Things like this, preserved this way (not so pretty well) can be tough to be sure of. Stromatolite, stromatoporoid, maybe even red algae seem like possibilities. I would expect to see more of a tubular structure, and less pronounced layering in a bryozoan though. 1 Link to comment Share on other sites More sharing options...
MPH Posted August 17, 2020 Author Share Posted August 17, 2020 Thanks, Rockwood. Yeah, I’ve struggled IDing this one for sure. Shape looked right for prasopora but the layering and no tubular structures definitely seems to point away. I couldn’t find much in the way of cross sectional examples of prasopora so thought maybe it was an outlier. Appreciate the input! Link to comment Share on other sites More sharing options...
Wrangellian Posted August 17, 2020 Share Posted August 17, 2020 Would there be any visible structure in the cross-section of a stromatoporoid, whether to the naked eye or under a loupe? If so and none is visible, I would go with stromatolite on this one (but without certainty). Link to comment Share on other sites More sharing options...
Rockwood Posted August 17, 2020 Share Posted August 17, 2020 58 minutes ago, Wrangellian said: Would there be any visible structure in the cross-section of a stromatoporoid Yes. Whether it was preserved and if you can see it are different questions though. 1 Link to comment Share on other sites More sharing options...
Wrangellian Posted August 17, 2020 Share Posted August 17, 2020 Ah, OK. Link to comment Share on other sites More sharing options...
Pumpkinhead Posted August 18, 2020 Share Posted August 18, 2020 You should be able to see pillars (often even with the naked eye) between laminae in a stromatoporoid, although as rockwood said this is preservation dependent. This is tough to pin down if its from till, because there's all sorts of layered things that can look similar if some of their structures have been destroyed. Its a neat fossil and I appreciate you sharing it with us Link to comment Share on other sites More sharing options...
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