Stromatoporoid?

[Gerde]

New to the Forum! Just a rookie looking for some help. This fossil was found just outside of Defiance, Ohio 70 yrs ago. The rock was found on the surface of a farm field, in an area not plowed.  Rock is approx 8 inches in length, with its entire surface uniformly covered in bumps. Under magnification, very small crustacean type organisms can be seen embedded in the rock. At first, I thought it may be a stromatoporoid, but bumps on surface may not have enough of a conical shape....?  Looking for advice on where in N.W. Ohio this could be taken for ID, if needed.

 

 

 

 

 

 

 

 

 

 

Edited January 21, 2019 by Gerde
remov ed duplicate pictures

[abyssunder]

Welcome to the Forum!
It's an interesting specimen.
Has a concave surface on one side? Can we have a picture of that?

[Bronzviking]

Do some research for Devonian Reef Fossils. I found this Devonian fossil tabulate coral which could be a worn coral that you have.

[Gerde]

Thanks due the input and questions!

 

Abyssunder....There is not any concave side. The rock is somewhat football shaped, and all sides really look very similar. 

 

Bronzviking.. Thanks for the tip. I'll look further into that coral. 

 

Does anyone know of an institution in N.W. Ohio that might be able to offer insight into a fossil such as this? 

[Herb]

I am not seeing a fossil here

[DPS Ammonite]

I think that this might be a piece of limestone that has been eroded in a sort of mini karst. Does the rock scratch with a knife blade? Does it fizz in acid? I also see possible pieces of shell or phylloid algae. Better up close photos may help us decide.

[minnbuckeye]

@Peat Burns may know where to take it

[abyssunder]

3 hours ago, DPS Ammonite said:

I think that this might be a piece of limestone that has been eroded in a sort of mini karst.

That was my first impression too.

If there is no lamellar character with pillars in a cross section, no clear astrorhizae on the top, no flat or concave shape at the bottom, no concentric structure visible at the base, I think it can't be similar to stromatoporoids, but I could be wrong.

 

[Deb in Michigan]

Dry dredgers fossil club out of Cincinnati might be able to help you with ID,  they have a website online and many members very familiar with Ohio fossils.  Keep us posted

  If you can find somebody to cut a slice of it, the inside may reveal more clearly preserved details which would help understanding.