This looks like one of the cheilostomate bryozoans.

Hi Jenny! What’s the age of these? That first one looks like one of the syringoporid or syringophyllid tabulates… probably the latter since it doesn’t appear to have those tubes(stolons?) that connect the corallites

Hi Joseph. Have you seen this?  Systematics, Phylogenetics, and Biogeography of Early Mississippian Camerate Crinoids of the Nunn Member, Lake Valley Formation, in south-central New Mexico

Hi, Evan, thanks for the response. About the only Fe minerals around here are the typical oxides, pyrite, and siderite. This doesn’t appear to be any of those. I’m pretty sure this was organic… I can’t think of a sed structure or mineral that would produce something like it???

Hi, Eleanor. The Gull River Fm. is Late Ordovician.

Chopping rocks, several years ago, in Upstate New York’s Gull River Fm.