Oddball Mississippian marine fossil chunks

[pefty]

Checking the constructed stone wall at the International Institute in St. Louis, Missouri, USA, I came across a couple of oddballs I couldn't quite place, so I'm requesting y'all's input. The rock is a poorly sorted skeletal grainstone that is pretty clearly Middle Mississippian (Visean) and likely quarried in southwest Missouri, though I'm still not sure if this is a Warsaw Formation equivalent or perhaps the St. Louis Formation.

 

#1: Tubuliferous cross-section

(Guesses: sponge, conulariid, chondrichthyan)

 

 

#2: Spheroid chain

(Guesses: sphinctozoan sponge)

 

For comparison and context, here is an assortment of other fossils from the same stretch of wall, presumably from the same batch of blocks from the same quarry:

 

Chondrichthyan (the dark area is not in shadow, it really is just an abruptly darker patch):

 

Archaeocidarid echinoid spines:

 

More echinoid spines and the rugose coral Amplexus(?):

 

Productid brachiopod:

 

Fenestellid bryozoans:

 

[Carl]

That first one could be a chondricthyan tooth but it would be pretty big. Only way to know would be to extract it, I suppose.

[pefty]

On 10/29/2024 at 3:09 PM, Carl said:

That first one could be a chondricthyan tooth but it would be pretty big. Only way to know would be to extract it, I suppose.

Thanks for this feedback and agreed. But to be honest I have seen much bigger teeth in the St. Louis Limestone!