Tackling a Specimen in Dolostone

[Baking Geologist]

I am wanting to tackle extracting whatever this dark fossil is.  But I’ve done very little fossil preparation (other than dissolving stuff with HFl but that’s a story for another day).

This is from the Racine Formation from Quarry Park and I picked up a bunch of other pieces to work on for practice.  I’m not used to handling dolostone.  I grew up with the Mississippian of Indiana, specifically Bloomington-Bedford area.  
 

Any suggestions welcome. 

 

 

 

 

 

[FranzBernhard]

I am having a hard time figuring out, what and where the fossil is. Would you like to point it out?
Thanks!
Franz Bernhard

[Baking Geologist]

Here is 2 pictures with the dark possible fossil circled

 

[FranzBernhard]

Thank you!

It doesn´t stand out much in the pics. What do you think could it be?
Franz Bernhard

[Baking Geologist]

I’m guessing brachiopod or a chert layer based on what I saw in other samples. But the darker color intrigues me.  

[FranzBernhard]

If its chert, you could it tackle with acid?
Franz Bernhard

Edited December 28, 2023 by FranzBernhard

[Baking Geologist]

I need to get some acid.  Among other things….

 

I've never done much prep and never done any prep of dolostone samples.  So I’m building a toolkit and looking for a good magnifier that will work over my glasses.