jeffmo Posted October 29, 2021 Share Posted October 29, 2021 (edited) A friend found these two items in Northwest Arkansas/SW Missouri in a stream bed. Wondering what they might be. and second item similar size without scale, sorry. Thanks for any comments. Edited October 29, 2021 by jeffmo NW Arkansas not NE Link to post Share on other sites
Tidgy's Dad Posted October 29, 2021 Share Posted October 29, 2021 Extremely good examples of layered concretions, especially that first one. 1 Link to post Share on other sites
Fossildude19 Posted October 29, 2021 Share Posted October 29, 2021 Agreed - these are Concretions. Link to post Share on other sites
jeffmo Posted October 29, 2021 Author Share Posted October 29, 2021 Very good. Thank you. I don't suppose there is any way to guess how old they might be? It would be nice to be able to tell the finder that they started accreting around the time of dinosaurs or something Link to post Share on other sites
FranzBernhard Posted October 29, 2021 Share Posted October 29, 2021 2 hours ago, jeffmo said: I don't suppose there is any way to guess how old they might be? Its difficult, indeed. However, you can get a maximum age, if you know what host strata they were found in. Maybe someone familiar with the geology of the area will comment. Franz Bernhard Link to post Share on other sites
Rockwood Posted October 29, 2021 Share Posted October 29, 2021 6 hours ago, jeffmo said: Very good. Thank you. I don't suppose there is any way to guess how old they might be? It would be nice to be able to tell the finder that they started accreting around the time of dinosaurs or something A quick check online would seem to indicate an earlier start on these. They likely form in a length of time that would look insignificant when compared to the geologic periods seen on color coded maps, but such maps are available. To cast a larger net/longer time period over it, Paleozoic I think would catch it. Link to post Share on other sites
Fossildude19 Posted October 29, 2021 Share Posted October 29, 2021 You can easily direct the finder to this topic for further explanation: Link to post Share on other sites
jeffmo Posted October 29, 2021 Author Share Posted October 29, 2021 Thanks for all the help. What an interesting group you all are! 1 Link to post Share on other sites
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