Hello everyone,   I'm New to the fossil forum. I'm from Minnesota and I've got some nice sized Ordovician fossil from the Platteville formation in Rochester, Minnesota. They're in Limestone sediment. One is a slab that is a filled on both side with crinoid stems (hoping for other rarer parts under the sediment on this slab). The other two are large section on cephalopods.   I'm looking for some advice/tips on how I should go about prepping them. Like what kind of tools should