Here is we are offering a nice detailed fossil sponge. This is a Diagonella cyathiformis from the Cambrian of Marjum Formation Utah. these type of fossils are uncommon in this layer. no restorations, no color, just a perfect sponge.
Diagonella cyathiformis has a tuft of long, straight, basal spicules that
anchored the animal in seafloor mud, from the middle Marjum Formation.