It is a super nice Protospongia with agnostida Ptychagnostus atavus trilobite walking on...
We are offering a nice detailed fossil sponge. This is a big sponge from the Cambrian of Marjum Formation Utah.
Cambrian fossil Protospongia hicksi? 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