I have this block of Limestone. I found it while fly-fishing. I believe it is from the lodgepole member of the Madison Limestone group. Mississippian in aged. This block has a number of brachiopods, Crinoids, and few bryozoans. At first I thought they were part of the crinoids. I no longer believe that. I am wondering what the mesh things are.
@david-powers Your mesh objects are bryozoan fronds. Possibly from the genus Archimedes. I’m not familiar with this particular formation but in the Mississippian of Indiana they would be from Archimedes most likely.