It is a super nice positive and negative Chancelloria sponge
We are offering a nice detailed fossil sponge. This is an undescribed sponge from the Cambrian of Marjum Formation Utah. Its skeleton is very elongate and it shows supernice spicule skin. Positive and negative.
Cambrian Chancelloria sp. fossil Marjum formation Utah
size: sponge ( 4 cm) slab 10 cm x 8 cm and 8 cm x 9 cm A+B
restoration: 2 glued part in negative