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I found the Glenwood formation
Today on another walk I found the Glenwood formation!
I had a hard time getting a big enough piece for a hone. I lapped 2. They are very soft and brittle. The larger one you can see I lapped sideways to the layers. The one side has many inclusions. Not good. the smaller one is much more cleaner but still has a few inclusions. That one is crumbling on one end. I don't know if it is from lapping under running water or from it drying out. At least when it is damp I could bevel the edges with my pocket knife. Lapping with sandpaper the clay or silt in it would create a suction between the stone and paper if not enough water used. I haven't used it yet except a few test strokes on my pocket knife but it seems about the coarseness of my 220 norton.
I an going to let them sit around for a while to stabalize. I think the main issue is going to be that they are very fragile. Even if the abrasive qualities are good.
Tim