smokeyjoe Posted October 12, 2020 Share Posted October 12, 2020 These two fossils were pushed to the surface of my back yard by frost heave after we had a new septic system installed. I would really appreciate it if someone would ID these for me and, if possible, please tell me a little something about them such as their age/geologic period. I have given them to my grandchildren and they would love to know more about them! They were found about 35 miles NW of Chicago. Thank you in advance! Link to comment Share on other sites More sharing options...
LabRatKing Posted October 12, 2020 Share Posted October 12, 2020 I see some partial calcite replacement/eroded crinoid columnals in the first (though could be a coral) and the end of a rugose coral. 1 Link to comment Share on other sites More sharing options...
smokeyjoe Posted October 12, 2020 Author Share Posted October 12, 2020 Thank you! Is there any way to judge the approximate age of them? Link to comment Share on other sites More sharing options...
Rockwood Posted October 12, 2020 Share Posted October 12, 2020 I'm fairly sure the first one is a sectioned branching rugose colony. The most prominent feature showing being the internal dissepiment. The septa somewhat obscured. 1 Link to comment Share on other sites More sharing options...
Kane Posted October 12, 2020 Share Posted October 12, 2020 Possibly Silurian or Devonian aged erratic. ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
LabRatKing Posted October 12, 2020 Share Posted October 12, 2020 8 minutes ago, smokeyjoe said: Thank you! Is there any way to judge the approximate age of them? Given they are cobbles, that will take some positive ID...which looks to me like @Rockwood nailed it...I always forget the branches! Link to comment Share on other sites More sharing options...
smokeyjoe Posted October 12, 2020 Author Share Posted October 12, 2020 I just did some of my own research on the age of these and now have a rough idea. Really fascinating stuff! Link to comment Share on other sites More sharing options...
smokeyjoe Posted October 12, 2020 Author Share Posted October 12, 2020 I just LOVE this forum! 2 Link to comment Share on other sites More sharing options...
Kane Posted October 12, 2020 Share Posted October 12, 2020 And we're glad to have you aboard. 1 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
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