Northwest Missouri, week ago, sorry , i usually say where im at, my apologizes...... I literally have a problem with picking up anything that looks cool, or out of my so called ordinary. I am about too have to dedicate a ROOM for the boxes of rocks, minerals, flake, cores, probably some poop somewhere too... haha.. I lived in Alabama till almost 4 years ago, just got into stone artifacts when my girlfriend inherited her grandfathers collection, not quite a year, and have found everything but what i look for. That glacier that drug itself across here brought literally everything with it. The Bison Antiquus, i have 8-10 nice bones, good skull fragment with 4 intact teeth, even a Cannon bone with tool marks in it. I cant for the life of me find a point, a preform, lots of flake though. I will prevail!!!!!
Good images. I'd say that these are bryozoans. These colonial animals build calcareous skeletons (often replaced by silica in fossils). Individual animals are called "zooids" and each living chamber is called a "zooecium." The opening in the living chamber is called an "aperture," while the whole colony is called a "zooarium."
Sooo . . . my guess is that you have fragments of several zooaria. Good finds.