Devonian worm burrows or organ pipe coral?

[SilurianSalamander]

Found two of these fossils now. Both on beaches that are probably Devonian in age. One is from SW Wisconsin on Lake Michigan and the other is in the Lower peninsula of Michigan from the shores of Lake Huron. Organ pipe coral or some sort of burrow trace fossil? Thanks!

[Rockwood]

Looks very similar to the feeding traces associated with Cornulites.

[fifbrindacier]

There is coral there, for sure.

[Rockwood]

4 hours ago, fifbrindacier said:

There is coral there, for sure.

Where ? What identifies it as coral to you ?

[Kane]

I agree with coral given what appear to be evenly spaced corallites. 

[Rockwood]

The don't look either to me.

[Kane]

13 minutes ago, Rockwood said:

The don't look either to me.

Well, it's basically my backyard material relatively speaking. It seems fairly diagnostically clear as weathered out coral. 

[Rockwood]

Marginally diagnostic mold fossil. Sure, I'll buy that. 

[Mark Kmiecik]

They're corals. You can find tons of it all around the shores of Lake Michigan. All heavily water-worn just as these two pieces.

[fifbrindacier]

22 hours ago, Rockwood said:

Where ? What identifies it as coral to you ?

 

22 hours ago, Kane said:

I agree with coral given what appear to be evenly spaced corallites. 

 

11 hours ago, Mark Kmiecik said:

They're corals. You can find tons of it all around the shores of Lake Michigan. All heavily water-worn just as these two pieces.

The corallites are very regularly spaced.

Some if the water-worned corals i find have that look.

[Rockwood]

48 minutes ago, fifbrindacier said:

The corallites are very regularly spaced.

Only if you recognize the fact that it's a mold in a rock and not a colony alone. 

I know a spot where heliolitid corals practically litter the ground. I had that sort of thing in mind.

Edited September 10, 2022 by Rockwood