Exploring a shallow cave in what is listed as Cambrian age sandstone I found numerous lumps projecting out of the caves ceiling. Many of these lumps are layered like onions. At first I thought they were stromatolites, because they are in Cambrian age rock or the rock matches descriptions of the Flathead Formation. After a bit of work I was able to free one of these lumps. The lump split open. Inside of it is a core of calcite surrounded by layers of orange or rusty yellow mesh, which is more like that of stromatoproidea. The calcite has impregnated a number of layers of the mesh but about 2 cn of mesh is open or unfilled. The part of the lump that was attached to the cave ceiling that part of the mesh is thinner then widens.
If what I have is of interest to researchers let me know.