Coral/Worm

[Rockwood]

This is from north(sort of)western Maine. The formation is of Emsian age and is related to a marine delta.The horn measures 4cm x 2cm.

Horn corals from this quarry are all full of trace fossils. This one is quite different though. Instead of crossing septa it seems to parallel them. It also is more tube like as opposed to the others that are solid rods. Could it have been a worm that lived commensurately with the coral leaving it's waste in the abandon base of the tube ?  

[ynot]

Kinda looks like a burrow in a shell that was filled before the shell eroded out.

[doushantuo]

Will look into Chaetosalpinx,Helicosalpinx*,Hicetes,etc

Covariation of size with that of the host corallite diameter might be an indicator for e.g. commensalism

*which has specific spiral angles

[Rockwood]

3 hours ago, doushantuo said:

Covariation of size with that of the host corallite diameter might be an indicator for e.g. commensalism

I should have known that. I studied morphodynamics as last winters project.

This one is definitely out. That would be the small end in such a scenario, and there is no sign of a taper.