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help ID my 2 backyard fossils


smokeyjoe

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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.5f84843e4376e_Fossil1.thumb.jpg.f368e748868dca01926fe797b5bf2f7f.jpg

 

Thank you in advance!

Fossil 2.jpg

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I see some partial calcite replacement/eroded crinoid columnals in the first (though could be a coral) and the end of a rugose coral.

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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.  

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Possibly Silurian or Devonian aged erratic.

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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!

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I just did some of my own research on the age of these and now have a rough idea.

 

Really fascinating stuff!

 

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And we're glad to have you aboard. :) 

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